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Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea
Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea
A Love Meter at a Framingham, Massachusetts Rest Stop.
A Love Meter at a Framingham, Massachusetts Rest Stop. Captain Nemo is a Fictional character featured in Jules Verne 's novels Twenty Thousand Leagues Under the Sea (1870 and The Mysterious For the 1954 film starring Kirk Douglas see 20000 Leagues Under the Sea.

In the physical sciences and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Physical science is an encompassing term for the branches of Natural science and Science that study non-living systems in contrast to the biological sciences Engineering is the Discipline and Profession of applying technical and scientific Knowledge and Measurement is the process of estimating the magnitude of some attribute of an object such as its length or weight relative to some standard ( unit of measurement) such as A physical Quantity is a physical property that can be quantified For other uses of Object see Object. In Philosophy, an object is a thing an Entity, or a Being. A phenomenon (from Greek φαινόμενoν, pl φαινόμενα - phenomena) is any observable occurrence Established standard objects and events are used as units, and the measurement results in a given number for the relationship between the item under study and the referenced unit of measurement. Measuring instruments and formal test methods are the means by which this translation is made. A test method is a definitive procedure that produces a test result All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty. Instrument error refers to the combined Accuracy and precision of a Measuring instrument, or the difference between the actual value and the value indicated by the In Metrology, measurement uncertainty describes a region about an observed value of a Physical quantity which is likely to enclose the true value of that quantity

Physicists use a vast range of instruments to perform their measurements. A physicist is a Scientist who studies or practices Physics. Physicists study a wide range of physical phenomena in many branches of physics spanning These range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. A stopwatch is a handheld Timepiece designed to measure the amount of time elapsed from a particular time when activated to when the piece is deactivated An electron microscope is a type of Microscope that uses Electrons to illuminate a specimen and create an enlarged image Virtual instrumentation is widely used in the development of modern measuring instruments. Virtual Instrumentation is the use of customizable software and modular measurement hardware to create user-defined measurement systems called Virtual instruments Traditional


Contents

Time

Timeline of time measurement technology


Mechanics

Length (i. For other uses see Time (disambiguation Time is a component of a measuring system used to sequence events to compare the durations of A transit telescope is a special purpose Telescope mounted so as to allow it to be pointed only at objects in the sky crossing the local meridian, an event known The word Calendar consist of two words 1 Cal ( in Pashto means Year in Hindi and Persian is Sal- also means Year A sundial is a device that measures time by the position of the Sun. An hourglass, also known as a sandglass, sand timer or sand clock, is a device for the measurement of Time. An egg timer is a device whose primary function is to measure a set amount of Time. A water clock or clepsydra ( Greek kleptein to steal; hydro water) is any timekeeper operated by means of a regulated flow of liquid into (inflow A pendulum clock is a Clock that uses a Pendulum, a swinging weight as its Timekeeping element A chronometer watch is a Watch tested and certified to meet certain precision standards A chronograph is a Timepiece or Watch with both Timekeeping and Stopwatch functions Circadian Locomotor Output Cycles Kaput, or Clock is a gene which encodes proteins regulating Circadian rhythm. A radio clock is a Clock that is Synchronized by a Time code bit stream transmitted by a Radio transmitter connected to a Time standard An atomic clock is a type of Clock that uses an Atomic resonance Frequency standard as its timekeeping element Radiometric dating (often called radioactive dating) is a technique used to date materials usually based on a comparison between the observed abundance of a naturally occurring Timeline of Time Measurement Technology 270 BC - Ctesibius builds a popular Water clock, called Mechanics ( Greek) is the branch of Physics concerned with the behaviour of physical bodies when subjected to Forces or displacements Length is the long Dimension of any object The length of a thing is the distance between its ends its linear extent as measured from end to end e. , distance)

see also Distance measuring equipment

Area

Level

Volume

(if the mass density of a solid is known, weighing allows to calculate the volume)

Speed


Acceleration

Mass

Linear momentum

Force (current of linear momentum)

Pressure (current density of linear momentum)

Current density is also called flux. An accelerometer is a device for measuring Acceleration and gravity induced reaction forces Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object A weighing scale (usually just "scale" in common usage except in Australian English where "scales" is more common is a Measuring instrument for A weighing scale (usually just "scale" in common usage except in Australian English where "scales" is more common is a Measuring instrument for A checkweigher is an automatic machine for checking the Weight of packaged commodities Mass spectrometry is an analytical technique that identifies the chemical composition of a compound or sample based on the Mass-to-charge ratio of charged particles A katharometer is a thermal conductivity device for determining one gas in a binary or pseudo-binary mixture In Classical mechanics, momentum ( pl momenta SI unit kg · m/s, or equivalently N · s) is the product A ballistic pendulum is a device for measuring a Bullet 's Momentum, from which it is possible to calculate the Velocity and Kinetic energy. In Physics, a force is whatever can cause an object with Mass to Accelerate. A spring scale is a Weighing scale used to measure Force, such as the force of Gravity, exerted on a Mass or the force of a person's grip A torsion spring is a spring that works by torsion or twisting that is a flexible elastic object that stores Mechanical energy when it is twisted A strain gauge (alternatively strain gage) is a device used to measure the strain of an object A tribometer is an instrument that measures Friction on a surface via a multitude of methods one of which is a ball sliding on the reference surface and giving a relative friction Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface Current density is a measure of the Density of flow of a conserved charge. In the various subfields of Physics, there exist two common usages of the term flux, both with rigorous mathematical frameworks

Timeline of temperature and pressure measurement technology

Angle

angular velocity or rotations per time unit

Angular momentum

Torque



Electricity and Electronics

electric charge

electric current (current of charge)

voltage (electric potential difference)

electric resistance

electric capacitance

electric inductance

Energy carried by Electricity

Power carried by Electricity (current of energy)

These are instruments used for measuring electrical properties. Capacitance is a measure of the amount of Electric charge stored (or separated for a given Electric potential. A capacitance meter is a piece of Electronic test equipment used to measure Capacitors Depending on the sophistication of the meter it may simply display the A LCR meter is a piece of Electronic test equipment used to measure among other things the impedance ( Inductance, Capacitance, resistance A LCR meter is a piece of Electronic test equipment used to measure among other things the impedance ( Inductance, Capacitance, resistance In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός The wattmeter is an instrument for measuring the Electric power (or the supply rate of Electrical energy) in Watts of any given circuit. Also see meter (electronics).

Electric Field (negative gradient of electric potential)


Magnetic Field


Thermodynamics

Temperature

unit overall range approximate precision
kelvin 0. 01-2,000 row 1, cell 3
celsius -273. 14-1,700 row 2, cell 3

Energy carried by Heat

This includes Thermal capacitance or temperature coefficient of energy, reaction energy, heat flow . wiki stranglesnakejpg|thumb|Thermographic image of a Snake held by a human]] Infrared Thermography, thermal imaging, or thermal video, is a type of Electromagnetic spectroscopy is the Spectroscopy of electromagnetic spectra which arise out of Atoms absorbing and emitting quanta of Electromagnetic A pyranometer is a type of Actinometer used to measure broadband Solar irradiance on a planar surface and is a sensor that is designed to measure the solar radiation The Stefan–Boltzmann law, also known as Stefan's law, states that the total Energy radiated per unit surface Area of a Black body in unit In Physics and other Sciences energy (from the Greek grc ἐνέργεια - Energeia, "activity operation" from grc ἐνεργός In Physics, heat, symbolized by Q, is Energy transferred from one body or system to another due to a difference in Temperature 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 In thermal physics, heat transfer is the passage of Thermal energy from a hot to a colder body . . Calorimeters are called passive if gauged to measure emerging heat, for example from chemical reactions. Calorimeters are called active or heated if they heat the sample, or reformulated: if they are gauged to fill the sample with a defined amount of heat.

see Calorimeter or Calorimetry

Entropy transfer

Phase change calorimeter's energy value divided by absolute temperature give the entropy exchanged. A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat Differential scanning calorimetry or DSC is a thermoanalytical technique in which the difference in the amount of Heat required to increase the Temperature A reaction calorimeter is an instrument that enables the Energy being released or absorbed by a reaction to be measured Actinometers are instruments used to measure the heating power of radiation. A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat Calorimetry is the Science of measuring the Heat of Chemical In Thermodynamics (a branch of Physics) entropy, symbolized by S, is a measure of the unavailability of a system ’s Energy Phase changes produce no entropy and therefore offer themselves as an entropy measurement concept. Thus entropy values occur indirectly by processing energy measurements at defined temperatures, without producing entropy.

Entropy content

The given sample is cooled down to (almost) absolute zero (for example by submerging the sample in liquid helium). At absolute zero temperature any sample is assumed to contain no entropy (see Third law of thermodynamics for further information). The third law of Thermodynamics is a statistical law of nature regarding Entropy and the impossibility of reaching Absolute zero of Temperature Then the following two calorimeter types are used to fill the sample with entropy until the desired temperature has been reached: (see also Thermodynamic databases for pure substances)

Entropy production

Processes transferring energy from a non-thermal carrier to heat as a carrier produce entropy (Example: mechanical/electrical friction). Thermodynamic databases contain information about thermodynamic properties for substances the most important being Enthalpy, Entropy, and A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat Either the produced entropy or heat are measured (calorimetry) or the transferred energy of the non-thermal carrier may be measured.

Entropy lowering its temperature - without loosing energy - produces entropy (Example: Heat conduction in an isolated rod; "thermal friction").

temperature coefficient of energy ("heat capacity")

Concerning a given sample, a proportionality factor relating temperature change and energy carried by heat. 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 If the sample is a gas, then this coefficient depends significantly on being measured at constant volume or at constant pressure. (The terminiology preference in the heading indicates that the classical use of heat bars it from having substance-like properties. )

specific temperature coefficient of energy ("Specific heat")

The temperature coefficient of energy divided by a substance-like quantity (amount of substance, mass, volume) describing the sample. A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat A calorimeter is a device used for Calorimetry, the Science of measuring the heat of Chemical reactions or Physical changes as well as Heat 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 amount of substance, n, of a sample or system is a Physical quantity which is proportional to the number of elementary entities present Mass is a fundamental concept in Physics, roughly corresponding to the Intuitive idea of how much Matter there is in an object The volume of any solid plasma vacuum or theoretical object is how much three- Dimensional space it occupies often quantified numerically Usually calculated from measurements by a division or could be measured directly using a unit amount of that sample.


Coefficient of thermal expansion

More on Condensed Matter, Gas

Amount of substance

usually determined indirectly by measuring volume, mass, molar concentration or "knowing particle number"


Plasticity of a solid

Tensile strength, Ductility or Malleability of a solid

Hardness of a solid

Shape and surface of a solid

Granularity of a solid or a suspension

Optical activity of a solid

Compressibility

Density

Substance Flow measurement

Substance potential or Chemical potential or molar Gibbs energy

The substance potential of a redox reaction is usually determined electrochemically using reversible cells. See also Grain and Film grain Granularity is a measure of the size of the components or descriptions of components that make up In Chemistry, A suspension is a Heterogenous fluid containing Solid particles that are sufficiently large for Sedimentation. Optical rotation or optical activity is the rotation of linearly polarized Light as it travels through certain materials Polarimetry is the measurement and interpretation of the Polarization of Transverse waves, most notably electromagnetic waves such as radio waves and Light In Thermodynamics and Fluid mechanics, compressibility is a measure of the relative volume change of a Fluid or Solid as a response The density of a material is defined as its Mass per unit Volume: \rho = \frac{m}{V} Different materials usually have different A hydrometer is an instrument used to measure the Specific gravity (or Relative density) of Liquids that is the ratio An aerometer is a scientific instrument used to measure the Weight and Density of a Gas or Liquid. Flow measurement is the quantification of bulk Fluid movement A water meter is a device used to measure the volume of water usage A gas meter is used to measure the volume of Fuel gases such as Natural gas and Propane. A Metering pump is a Pump used to pump Liquids at adjustable Flow rates which are precise when averaged over time A mass flow meter, also known as inertial flow meter and coriolis flow meter, is a device that measures how much fluid is flowing through a tube In Thermodynamics and Chemistry, chemical potential, symbolized by μ, is a term introduced by the American engineer chemist and mathematical In Thermodynamics, the Gibbs free energy ( IUPAC recommended name Gibbs energy or Gibbs function) is a Thermodynamic potential which Redox (shorthand for reduction-oxidation reaction describes all Chemical reactions in which atoms have their Oxidation number ( Oxidation state A chemical reaction is a process that always results in the interconversion of Chemical substances The substance or substances initially involved in a chemical reaction are called Electrochemistry is a branch of Chemistry that studies Chemical reactions which take place in a Solution at the interface of an electron conductor

Substance content in mixtures


pH: Concentration of Protons in a Solution


Humidity

Rays ("Waves" and "Particles")

Sound, compression waves in matter

Sound pressure

Light and radiation without a rest mass

(for lux meter see the section about human senses and human body)

Photon polarization

Pressure (current density of linear momentum)

radiant flux

The measure of the total power of light emitted. wiki stranglesnakejpg|thumb|Thermographic image of a Snake held by a human]] Infrared Thermography, thermal imaging, or thermal video, is a type of A phototube is a type of gas-filled or Vacuum tube that is extremely sensitive to light in the Ultraviolet, visible, and Near-infrared Photographic plates preceded Photographic film as a mean of photography A camera is a device used to capture images either as still Photographs or as sequences of moving images ( Movies or Videos. Photomultiplier tubes ( photomultipliers or PMT s for short members of the class of Vacuum tubes and more specifically Phototubes are extremely Photon polarization is the quantum mechanical description of the classical polarized sinusoidal plane electromagnetic wave A polarizer is a device that converts an unpolarized or mixed- Polarization beam of Electromagnetic waves (e Pressure (symbol 'p' is the force per unit Area applied to an object in a direction perpendicular to the surface Current density is a measure of the Density of flow of a conserved charge. A Nichols radiometer is the apparatus used by Ernest Fox Nichols and Gordon Ferrie Hull in 1901 for the measurement of Radiation pressure. In Radiometry, radiant flux or radiant power is the measure of the total power of Electromagnetic radiation (including Infrared,

Radiation with a rest mass, Particle radiation

Cathode Ray

Atom polarization and electron polarization


Ionizing Radiation

Ionizing radiation includes rays of "particles" as well as rays of "waves". Radiation, as in Physics, is Energy in the form of waves or moving Subatomic particles emitted by an atom or other body as it changes from a higher energy Particle radiation is the radiation of Energy by means of fast-moving Subatomic particles. Cathode rays (also called an electron beam or e-beam) are streams of Electrons observed in Vacuum tubes i A Crookes tube is an early experimental Discharge tube, invented by British physicist William Crookes and others around 1875 in which Cathode rays The cathode ray tube (CRT is a Vacuum tube containing an Electron gun (a source of electrons and a Fluorescent screen with internal or In Quantum mechanics, the Stern–Gerlach experiment, named after Otto Stern and Walther Gerlach, is an important 1922 experiment on the Deflection Radiation, as in Physics, is Energy in the form of waves or moving Subatomic particles emitted by an atom or other body as it changes from a higher energy Especially X-rays and Gamma rays transfer enough energy in non-thermal, (single) collision processes to separate electron(s) from an atom. X-radiation (composed of X-rays) is a form of Electromagnetic radiation. Gamma rays (denoted as &gamma) are a form of Electromagnetic radiation or light emission of frequencies produced by sub-atomic particle interactions

particle current

Human Senses and Human Body

concentration or partial pressure of carbon dioxide in the respiratory gases

power, work

luminuos flux, Photometry

A measure of the perceived power of light, luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light. Computed tomography (CT is a Medical imaging method employing Tomography. Radiology is the medical specialty directing Medical imaging technologies to diagnose and treat diseases In Chemistry, concentration is the measure of how much of a given substance there is mixed with another substance In a mixture of Ideal gases each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume Carbon dioxide ( Chemical formula:) is a Chemical compound composed of two Oxygen Atoms covalently bonded to a single Capnography is the monitoring of the concentration or partial pressure of Carbon dioxide (CO2 in the respiratory gases

illuminance, Photometry

See also: Category:Physiological instruments


Meteorology

See also Category:Meteorological instrumentation and equipment. In photometry, illuminance is the total Luminous flux incident on a surface per unit Area. A light meter is a device used to measure the amount of Light. In the broadest sense a photometer is any instrument used to measure Illuminance or Irradiance. A densitometer is a device that measures the degree of darkness (the Optical density) of a photographic or semitransparent material or of a reflecting surface Meteorology (from Greek grc μετέωρος metéōros, "high in the sky" and grc -λογία -logia) is the Interdisciplinary

Navigation

See also Category:Navigational equipment. Navigation is the process of reading and controlling the movement of a craft or vehicle from one place to another

Uncategorized, Specialized application


Notes

Note that the alternate spelling "-metre" is never used when referring to a measuring device. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International

See also

A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument Timeline of Temperature and Pressure Measurement Technology A history of Temperature measurement and Pressure measurement
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