Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames. A flame is often defined as the visible (light-emitting part of a Fire. Fuel is any material that is burned or altered in order to obtain energy In Thermodynamics, the word exothermic "outside heating" describes a process or reaction that releases Energy usually in the form of Heat, but Fuel is any material that is burned or altered in order to obtain energy An oxidizing agent or oxidising agent (also called an oxidant, oxidizer or oxidiser) can be defined as either a Chemical compound In Physics, heat, symbolized by Q, is Energy transferred from one body or system to another due to a difference in Temperature In Physics, heat, symbolized by Q, is Energy transferred from one body or system to another due to a difference in Temperature Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700 A flame is often defined as the visible (light-emitting part of a Fire.

Direct combustion by atmospheric oxygen is a reaction mediated by radical intermediates. In Chemistry, radicals (often referred to as free radicals) are atoms molecules or ions with Unpaired electrons on an otherwise Open shell The conditions for radical production are naturally produced by thermal runaway, where the heat generated by combustion is necessary to maintain the high temperature necessary for radical production. Thermal runaway refers to a situation where an increase in temperature changes the conditions in a way that causes a further increase in temperature leading to a destructive result

In a complete combustion reaction, a compound reacts with an oxidizing element, such as oxygen or fluorine, and the products are compounds of each element in the fuel with the oxidizing element. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Fluorine, fluorum meaning "to flow" is the Chemical element with the symbol F and Atomic number 9 For example:

CH₄ + 2O₂ → CO₂ + 2H₂O

CH₂S + 6F₂ → CF₄ + 2HF + SF₆

A simpler example can be seen in the combustion of hydrogen and oxygen, which is a commonly used reaction in rocket engines:

2H₂ + O₂ → 2H₂O + heat

The result is water vapor. Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the

In the large majority of the real world uses of combustion, the oxygen (O₂) oxidant is obtained from the ambient air and the resultant flue gas from the combustion will contain nitrogen:

CH₄ + 2O₂ + 7. Flue gas is Gas that exits to the atmosphere via a Flue, which is a pipe or channel for conveying exhaust gases from a fireplace oven Furnace, Boiler Nitrogen (ˈnaɪtɹəʤɪn is a Chemical element that has the symbol N and Atomic number 7 and Atomic weight 14 52N₂ → CO₂ + 2H₂O + 7. 52N₂ + heat

As can be seen, when air is the source of the oxygen, nitrogen is by far the largest part of the resultant flue gas.

In reality, combustion processes are never perfect or complete. In flue gases from combustion of carbon (as in coal combustion) or carbon compounds (as in combustion of hydrocarbons, wood etc. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 In Organic chemistry, a hydrocarbon is an Organic compound consisting entirely of Hydrogen and Carbon. Wood is hard fibrous lignified structural tissue produced as secondary Xylem in the stems of Woody plants notably trees but also shrubs ) both unburned carbon (as soot) and carbon compounds (CO and others) will be present. Soot (ˈsʊt is a general term that refers to the black impure carbon particles resulting from the incomplete combustion of a hydrocarbon Carbon monoxide, with the chemical formula CO is a colorless odorless tasteless yet highly toxic Gas. Also, when air is the oxidant, some nitrogen will be oxidized to various nitrogen oxides (NO_x). The term nitrogen oxide typically refers to any Binary compound of Oxygen and Nitrogen, or to a mixture of such compounds Nitric

Contents 1 Types 1.1 Rapid 1.2 Slow 1.3 Complete 1.4 Turbulent 1.5 Microgravity 1.6 Incomplete 1.7 Smouldering 2 Combustion with other oxidants 3 Chemical equation 4 Fuels 4.1 Liquid fuels 4.2 Solid fuels 5 Reaction mechanism 6 Temperature 7 Instabilities 8 See also 8.1 Related concepts 8.2 Machines and equipment 8.3 Measurement techniques 8.4 Social applications and issues 9 External links

Types

Rapid

Rapid combustion is a form of combustion in which large amounts of heat and light energy are released, which often results in a fire. Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700 Fire is the heat and light energy released during a Chemical reaction, in particular a combustion reaction. This is used in a form of machinery such as internal combustion engines and in thermobaric weapons. The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a Thermobaric weapons distinguish themselves from conventional Explosive weapons by using atmospheric Oxygen, instead of carrying an Oxidizer in their Sometimes, a large volume of gas is liberated in combustion besides the production of heat and light. The sudden evolution of large quantities of gas creates excessive pressure that produces a loud noise. Such a combustion is known as an explosion. An explosion is a sudden increase in Volume and release of Energy in an extreme manner usually with the generation of high Temperatures and the release

Slow

Slow combustion is a form of combustion which takes place at low temperatures. Cellular respiration is an example of slow combustion. Cellular respiration is the set of the metabolic reactions and processes that take place in Organisms cells to convert biochemical energy from

Complete

In complete combustion, the reactant will burn in oxygen, producing a limited number of products. When a hydrocarbon burns in oxygen, the reaction will only yield carbon dioxide and water. In Organic chemistry, a hydrocarbon is an Organic compound consisting entirely of Hydrogen and Carbon. When a hydrocarbon or any fuel burns in air, the combustion products will also include nitrogen. When elements such as carbon, nitrogen, sulfur, and iron are burned, they will yield the most common oxides. Carbon will yield carbon dioxide. Nitrogen will yield nitrogen dioxide. Nitrogen dioxide is the Chemical compound with the formula N[[Oxygen O]]2 Sulfur will yield sulfur dioxide. Iron will yield iron(III) oxide. Iron(III oxide —also known as ferric oxide, Hematite, red iron oxide, synthetic maghemite, colcothar, or simply Rust —is It should be noted that complete combustion is almost impossible to achieve. In reality, as actual combustion reactions come to equilibrium, a wide variety of major and minor species will be present. In a Chemical process, chemical equilibrium is the state in which the chemical activities or Concentrations of the reactants and products have no net change For example, the combustion of methane in air will yield, in addition to the major products of carbon dioxide and water, the minor product carbon monoxide and nitrogen oxides, which are products of a side reaction (oxidation of nitrogen).

Turbulent

Turbulent combustion is a combustion characterized by turbulent flows. It is the most used for industrial application (e. g. gas turbines, diesel engines, etc. ) because the turbulence helps the mixing process between the fuel and oxidizer.

Microgravity

Nearly every Flame behaves differently in the Microgravity environment. A flame is often defined as the visible (light-emitting part of a Fire. Microgravity combustion research contributes to understanding of spacecraft fire safety and diverse aspects of combustion physics.

Incomplete

Incomplete combustion occurs when there isn't enough oxygen to allow the fuel (usually a hydrocarbon) to react completely with the oxygen to produce carbon dioxide and water, also when the combustion is quenched by a heat sink such as a solid surface or flame trap. When a hydrocarbon burns in air, the reaction will yield carbon dioxide, water, carbon monoxide, pure carbon (soot or ash) and various other compounds such as nitrogen oxides. Carbon dioxide ( Chemical formula:) is a Chemical compound composed of two Oxygen Atoms covalently bonded to a single Carbon monoxide, with the chemical formula CO is a colorless odorless tasteless yet highly toxic Gas. The term nitrogen oxide typically refers to any Binary compound of Oxygen and Nitrogen, or to a mixture of such compounds Nitric

The quality of combustion can be improved by design of combustion devices, such as burners and internal combustion engines. The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a Further improvements are achievable by catalytic after-burning devices (such as catalytic converters) or by the simple partial return of the exhaust gases into the combustion process. Catalysis is the process in which the rate of a Chemical reaction is increased by means of a Chemical substance known as a catalyst A catalytic converter (colloquially "cat" or "catcon" is a device used to reduce the toxicity of emissions from an Internal combustion engine. Such devices are required by environmental legislation for cars in most countries, and may be necessary in large combustion devices, such as thermal power plants, to reach legal emission standards. Environmental law is a complex and interlocking body of Statutes, Common law, Treaties, conventions Regulations and policies which very A thermal power station is a Power plant in which the prime mover is Steam driven Emission standards are requirements that set specific limits to the amount of Pollutants that can be released into the environment

The degree of combustion can be measured and analyzed, with test equipment. HVAC contractors, firemen and engineers use combustion analyzers to test the efficiency of a burner during the combustion process. HVAC (pronounced either "H-V-A-C" or occasionally " H-vak " is an Initialism or Acronym that stands for " Heating An engineer is a person professionally engaged in a field of Engineering. In addition, the efficiency of an internal combustion engine can be measured in this way, and some states and local municipalities are using combustion analysis to define and rate the efficiency of vehicles on the road today.

Smouldering

Smouldering combustion is a flameless form of combustion, deriving its heat from heterogeneous reactions occurring on the surface of a solid fuel when heated in an oxidizing environment. Smouldering (or smoldering in American spelling is a Flameless form of Combustion, deriving its heat from oxidations occurring on the surface of a The fundamental difference between smouldering and flaming combustion is that in smouldering, the oxidation of the reactant species occurs on the surface of the solid rather than in the gas phase. The characteristic temperature and heat released during smouldering are low compared to those in the flaming combustion of a solid. Typical values in smouldering are around 600 °C for the peak temperature and 5 kJ/g-O₂ for the heat released; typical values during flaming are around 1500 °C and 13 kJ/g-O₂ respectively. These characteristics cause smoulder to propagate at low velocities, typically around 0. 1 mm/s, which is about two orders of magnitude lower than the velocity of flame spread over a solid. In spite of its weak combustion characteristics, smouldering is a significant fire hazard.

Combustion with other oxidants

Oxygen can be assumed as the oxidant when talking about combustion, but other oxidants exist. Oxygen (from the Greek roots ὀξύς (oxys (acid literally "sharp" from the taste of acids and -γενής (-genēs (producer literally begetteris the Nitrous oxide is used in rockets and in motorsport; it produces oxygen at over 1300 C. Nitrous oxide, commonly known as " laughing gas," is a Chemical compound with the Chemical formula N 2 O. Fluorine, another oxidizing element, can produce a combustion reaction, to produce fluorinated products (rather than oxides). For example, mixtures of gaseous fluorine and methane are explosive, just like mixtures of oxygen and methane. Fluorine, fluorum meaning "to flow" is the Chemical element with the symbol F and Atomic number 9 Methane is a Chemical compound with the molecular formula. It is the simplest Alkane, and the principal component of Natural gas. Chlorine trifluoride is a strong fluorinating agent that ignites fuels more readily than oxygen. Chlorine trifluoride is the Chemical compound with the formula ClF3

Chemical equation

Generally, the chemical equation for stoichiometric burning of hydrocarbon in oxygen is as follows:

For example, the burning of propane is:

The simple word equation for the combustion of a hydrocarbon in oxygen is:

If the combustion takes place using air as the oxygen source, the nitrogen can be added to the equation, although it does not react, to show the composition of the flue gas:

For example, the burning of propane is:

The simple word equation for the combustion of a hydrocarbon in air is:

Nitrogen may also oxidize when there is an excess of oxygen. A chemical equation is a symbolic representation of a Chemical reaction. Stoichiometry (sometimes called reaction stoichiometry to distinguish it from composition stoichiometry is the Calculation of Quantitative (measurable In Organic chemistry, a hydrocarbon is an Organic compound consisting entirely of Hydrogen and Carbon. Propane is a three- Carbon Alkane, normally a gas but compressible to a liquid that is transportable Propane is a three- Carbon Alkane, normally a gas but compressible to a liquid that is transportable The reaction is thermodynamically favored only at high temperatures. Diesel engines are run with an excess of oxygen to combust small particles that tend to form with only a stoichiometric amount of oxygen, necessarily producing nitrogen oxide emissions. A diesel engine is an Internal combustion engine which operates using the Diesel cycle (named after Dr Both the United States and European Union are planning to impose limits to nitrogen oxide emissions, which necessitate the use of a special catalytic converter or treatment of the exhaust with urea. A catalytic converter (colloquially "cat" or "catcon" is a device used to reduce the toxicity of emissions from an Internal combustion engine. Urea is an Organic compound with the Chemical formula ( N[[hydrogen H]]22 C[[oxygen O]]

Fuels

Liquid fuels

Combustion of a liquid fuel in an oxidizing atmosphere actually happens in the gas phase. It is the vapour that burns, not the liquid. Therefore, a liquid will normally catch fire only above a certain temperature: its flash point. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air The flash point of a liquid fuel is the lowest temperature at which it can form an ignitable mix with air. It is also the minimum temperature at which there is enough evaporated fuel in the air to start combustion.

Solid fuels

The act of combustion consists of three relatively distinct but overlapping phases:

• Preheating phase, when the unburned fuel is heated up to its flash point and then fire point. Fuel is any material that is burned or altered in order to obtain energy The fire point of a Fuel is the temperature at which it will continue to burn after ignition for at least 5 seconds Flammable gases start being evolved in a process similar to dry distillation. Dry distillation is the Heating of Solid materials to produce Liquid or Gaseous products (which may condense into solids
• Distillation phase or gaseous phase, when the mix of evolved flammable gases with oxygen is ignited. Energy is produced in the form of heat and light. Flames are often visible. Heat transfer from the combustion to the solid maintains the evolution of flammable vapours.
• Charcoal phase or solid phase, when the output of flammable gases from the material is too low for persistent presence of flame and the charred fuel does not burn rapidly anymore but just glows and later only smoulders. Charring is a process of incomplete Combustion that often occurs when Biological tissue (living or dead is subjected to Heat. Smouldering (or smoldering in American spelling is a Flameless form of Combustion, deriving its heat from oxidations occurring on the surface of a

Reaction mechanism

Combustion in oxygen is a radical chain reaction where many distinct radical intermediates participate.

The high energy required for initiation is explained by the unusual structure of the dioxygen molecule. The lowest-energy configuration of the dioxygen molecule is a stable, relatively unreactive diradical in a triplet spin state. Triplet oxygen is the Ground state of the Oxygen molecule The Electron configuration of the molecule has two unpaired electrons occupying two degenerate Bonding can be described with three bonding electron pairs and two antibonding electrons, whose spins are aligned, such that the molecule has nonzero total angular momentum. In Quantum mechanics, spin is a fundamental property of atomic nuclei, Hadrons and Elementary particles For particles with non-zero spin Most fuels, on the other hand, are in a singlet state, with paired spins and zero total angular momentum. Interaction between the two is quantum mechanically a "forbidden transition", i. A forbidden mechanism or forbidden line is a concept in Physics / Chemistry. e. possible with a very low probability. To initiate combustion, energy is required to force dioxygen into a spin-paired state, or singlet oxygen. Singlet oxygen is the common name used for the two Metastable states of molecular Oxygen (O2 with higher energy than the ground state Triplet oxygen This intermediate is extremely reactive. The energy is supplied as heat. The reaction produces heat, which keeps it going.

Combustion of hydrocarbons is thought to be initiated by the abstraction of a hydride radical (H) from the fuel to oxygen, to give a hydroperoxide radical (HOO). This reacts further to give hydroperoxides, which break up to give hydroxyl radicals. Hydroxyl in Chemistry stands for a molecule consisting of an Oxygen atom and a Hydrogen atom connected by a Covalent bond. There are a great variety of these processes that produce fuel radicals and oxidizing radicals. Oxidizing species include singlet oxygen, hydroperoxide, hydroxyl, monatomic oxygen, and hydroperoxyl (OH₂). Such intermediates are short-lived and cannot be isolated. However, non-radical intermediates are stable and are produced in incomplete combustion. An example is acetaldehyde produced in the combustion of ethanol. Acetaldehyde, sometimes known as ethanal, is an organic chemical compound with the formula C[[Hydrogen H]]3CH O or MeCHO An intermediate in the combustion of carbon and hydrocarbons, carbon monoxide, is of special importance because it is a poisonous gas. Carbon monoxide, with the chemical formula CO is a colorless odorless tasteless yet highly toxic Gas. In the context of Biology, poisons are substances that can cause damage, Illness, or Death to Organisms usually by

Solid fuels also undergo a great number of pyrolysis reactions that give more easily oxidized, gaseous fuels. Pyrolysis is the Chemical decomposition of organic materials by heating in the absence of Oxygen or any other reagents except possibly Steam These reactions are endothermic and require constant energy input from the combustion reactions. A lack of oxygen or other poorly designed conditions result in these noxious and carcinogenic pyrolysis products being emitted as thick, black smoke.

Temperature

Assuming perfect combustion conditions, such as complete combustion under adiabatic conditions (i. e. , no heat loss or gain), the adiabatic combustion temperature can be determined. The formula that yields this temperature is based on the first law of thermodynamics and takes note of the fact that the heat of combustion is used entirely for heating the fuel, the combustion air or oxygen, and the combustion product gases (commonly referred to as the flue gas). In Thermodynamics, the first law of thermodynamics is an expression of the more universal physical law of the Conservation of energy. The heat of combustion (ΔHc0 is the Energy released as Heat when a compound undergoes complete Combustion with Oxygen Flue gas is Gas that exits to the atmosphere via a Flue, which is a pipe or channel for conveying exhaust gases from a fireplace oven Furnace, Boiler

In the case of fossil fuels burnt in air, the combustion temperature depends on all of the following:

• the heating value;
• the stoichiometric air to fuel ratio λ;
• the specific heat capacity of fuel and air;
• the air and fuel inlet temperatures. The heat of combustion (ΔHc0 is the Energy released as Heat when a compound undergoes complete Combustion with Oxygen Air-fuel ratio ( AFR) is the mass ratio of air to fuel present during combustion Specific heat capacity, also known simply as specific heat, is the measure of the heat energy required to increase the Temperature of a unit quantity

The adiabatic combustion temperature (also known as the adiabatic flame temperature) increases for higher heating values and inlet air and fuel temperatures and for stoichiometric air ratios approaching one. In the study of Combustion, there are two types of adiabatic flame temperature depending on how the process is completed constant volume and constant pressure

Most commonly, the adiabatic combustion temperatures for coals are around 2200 °C (for inlet air and fuel at ambient temperatures and for λ = 1. 0), around 2150 °C for oil and 2000 °C for natural gas.

In industrial fired heaters, power plant steam generators, and large gas-fired turbines, the more common way of expressing the usage of more than the stoichiometric combustion air is percent excess combustion air. A furnace is a device used for Heating The name derives from Latin fornax, Oven. A power station (also referred to as generating station, power plant or powerhouse) is an industrial facility for the generation of A gas turbine, also called a combustion turbine, is a rotary Engine that extracts energy from a flow of Combustion gas Air-fuel ratio ( AFR) is the mass ratio of air to fuel present during combustion For example, excess combustion air of 15 percent means that 15 percent more than the required stoichiometric air is being used.

Instabilities

Combustion instabilities are typically violent pressure oscillations in a combustion chamber. These pressure oscillations can be as high as 180dB, and long term exposure to these cyclic pressure and thermal loads reduces the life of engine components. In rockets, such as the F1 used in the Saturn V program, instabilities led to massive damage of the combustion chamber and surrounding components. This problem was solved by re-designing the fuel injector. In liquid jet engines the droplet size and distribution can be used to attenuate the instabilities. Combustion instabilities are a major concern in ground-based gas turbine engines because of NOx emissions. The tendency is to run lean, an equivalence ratio less than 1, to reduce the combustion temperature and thus reduce the NOx emissions; however, running the combustion lean makes it very susceptible to combustion instabilities.

The Rayleigh Criterion is the basis for analysis of thermoacoustic combustion instabilities and is evaluated using the Rayleigh Index over one cycle of instability. Angular resolution describes the resolving power of any image forming device such as an optical or Radio telescope, a Microscope, a Camera

When the heat release oscillations are in phase with the pressure oscillations the Rayleigh Index is positive and the magnitude of the thermo acoustic instability increases. Consecutively if the Rayleigh Index is negative then thermoacoustic damping occurs. The Rayleigh Criterion implies that a thermoacoustic instability can be optimally controlled by having heat release oscillations 180 degrees out of phase with pressure oscillations at the same frequency. This minimizes the Rayleigh Index.

See also

Related concepts Air-fuel ratio Deflagration Detonation Fire Flue gas emissions from fossil fuel combustion Flue gas stacks Gas stoichiometry Heat of combustion Phlogiston theory (historical) Pyrolysis Pyrophoric Smouldering Spontaneous combustion Stoichiometry Chemical looping combustion

Machines and equipment Boiler Water heater Cyclone furnace External combustion engine Industrial furnaces Gas turbine Internal combustion engine Jet engine Rocket engine Rotary combustion engine Staged combustion cycle (rocket)

Measurement techniques Calorimeter Coherent anti-Stokes Raman spectroscopy (CARS) Laser Doppler velocimetry Laser-induced fluorescence Particle image velocimetry Thin filament pyrometry Social applications and issues Cooking Cooking oil Global warming Immolation

External links

• Hydrocarbon combustion Simple applet that illustrates the Chemical equation. Air-fuel ratio ( AFR) is the mass ratio of air to fuel present during combustion Deflagration (Lat de + flagrare, "to burn down" is a technical term describing subsonic Combustion that usually propagates through Thermal conductivity Detonation is a process of Supersonic Combustion in which a Shock wave is propagated forward due to energy release in a reaction zone behind it Fire is the heat and light energy released during a Chemical reaction, in particular a combustion reaction. Flue gas emissions from fossil fuel combustion refers to the Combustion product gas resulting from the burning of Fossil fuels. A flue gas stack is a type of Chimney, a vertical pipe channel or similar structure through which Combustion product gases called Flue gases are exhausted Stoichiometry (sometimes called reaction stoichiometry to distinguish it from composition stoichiometry is the Calculation of Quantitative (measurable The heat of combustion (ΔHc0 is the Energy released as Heat when a compound undergoes complete Combustion with Oxygen The phlogiston theory (from the Ancient Greek φλογιστόν phlŏgistón "burning up" from φλόξ phlóx "fire" first stated Pyrolysis is the Chemical decomposition of organic materials by heating in the absence of Oxygen or any other reagents except possibly Steam A pyrophoric substance will ignite spontaneously that is its Autoignition temperature is below Room temperature. Smouldering (or smoldering in American spelling is a Flameless form of Combustion, deriving its heat from oxidations occurring on the surface of a Spontaneous combustion is a type of Combustion which occurs without an external ignition source Stoichiometry (sometimes called reaction stoichiometry to distinguish it from composition stoichiometry is the Calculation of Quantitative (measurable Chemical looping combustion (CLC typically employs a dual Fluidized bed system (circulating fluidized bed process where a metal oxide is employed as a bed material providing A boiler is a closed vessel in which Water or other Fluid is heated Water heating is a thermodynamic process using an energy source to heat Water above its initial Temperature. A cyclone furnace is a type of Coal Combustor commonly used in large industrial Boilers. An external combustion engine (EC engine is a Heat engine where an (internal working Fluid is heated by combustion of an external source through the Engine A furnace is a device used for Heating The name derives from Latin fornax, Oven. A gas turbine, also called a combustion turbine, is a rotary Engine that extracts energy from a flow of Combustion gas The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a specific --->A jet engine is a Reaction engine that discharges a fast moving jet of Fluid to A rocket engine is a Jet engine that uses only Propellant mass for forming its high speed propulsive jet. This article is about Internal combustion engines that do not use conventional Pistons See also Rotary engine (disambiguation for other uses of this The staged combustion cycle is a Thermodynamic cycle of Bipropellant rocket rocket Engines Some of the propellant is burned in a pre-burner and the A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat Coherent anti-Stokes Raman spectroscopy, also called Coherent anti-Stokes Raman scattering spectroscopy (CARS is a form of Spectroscopy used primarily in Chemistry Laser Doppler Velocimetry (LDV also known as laser Doppler anemometry or LDA is a technique for measuring the direction and speed of Fluids (or any other material that is processed For other uses see LIF. Laser-induced fluorescence (LIF is a spectroscopic method used for studying structure of molecules detection Particle image velocimetry ( PIV) is an optical method used to measure velocities and related properties in Fluids The fluid is Seeded with Thin Filament Pyrometry (TFP is an optical method used to measure temperatures Cooking is the process of preparing Food by applying Heat, selecting measuring and combining of ingredients in an ordered procedure for producing safe and edible Cooking oil is purified Fat of Plant or Animal origin which is liquid at room temperature Global warming is the increase in the average measured temperature of the
• Fuel efficiency (stoichiometric air fuel mixture) vs. decreased emissions in combustion engines
• Explaining burning using the candle.
• Fuel efficiency (stoichiometric air fuel mixture) vs. decreased emissions in combustion engines
• Simulation of gas combustion

© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic