A Helium atom,
having a radius of 31 picometres. Helium ( He) is a colorless odorless tasteless non-toxic Inert Monatomic Chemical

A picometre (American spelling: picometer, symbol pm) is a unit of length in the metric system, equal to one trillionth (¹/_{1,000,000,000,000}) of a metre, which is the current SI base unit of length. Phonology North American English regional phonology In many ways compared to English English, North American English is conservative in its Phonology. 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 The metric system is a decimalised system of measurement. It exists in several variations with different choices of base units, though the choice of base units does The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International The International System of Units (SI defines seven dimensionally independent SI base units. It can be written in scientific notation as 1×10⁻¹² m (engineering notation) or 1 E-12 m (exponential notation) — both meaning 1 m / 1,000,000,000,000. Scientific notation, also sometimes known as standard form or as exponential notation, is a way of writing numbers that accommodates values too large or small to be

It equals a millionth of a micrometre (formerly called a micron), and was formerly called micromicron or bicron (and written as µµ^[1]). A micrometre ( American spelling: micrometer; symbol µm) is one millionth of a Metre, or equivalently one thousandth of a Millimetre
It equals a hundredth of an Ångström, an internationally recognized non-SI unit of length. An ångström or angstrom (symbol Å) (ˈɔːŋstrəm Swedish: ˈɔ̀ŋstrœm is an internationally recognized non- SI unit of length equal

See also

• 1 E-12 m
• SI
• SI prefix
• Metric system
• Orders of magnitude (length)
• Conversion of units, for comparison with other units of length. An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol to form a Decimal multiple or yotta- (symbol Y) is an SI prefix in the SI ( System of units) denoting 1024 or 1 000 000 000 000 000 000 000 000 zetta- (symbol Z) is an SI prefix in the SI ( System of units) denoting 1021 or 1 000 000 000 000 000 000 000 exa- (symbol E) is a prefix in the SI system of units denoting 1018 or 1 000 000 000 000 000 000 In Physics and Mathematics, peta- (symbol P) is a prefix in the SI ( System of units) denoting 1015 teras- (symbol T) is a prefix in the SI system of units denoting 1012, or 1000000000000 (1 trillion For other meanings see Giga (disambiguation Giga- (symbol G is a prefix in the SI system of units denoting 109 Mega- (symbol M) is an SI prefix in the SI system of units denoting a factor of 106, 1000000 (one Million Kilo- (symbol k is a prefix in the SI and other systems of units denoting 103 or 1000 hecto- or hecta- (symbol h) is a SI prefix in the SI system of units denoting a factor of 102 (100 deca- or deka- is an SI prefix (symbol da) in the SI system of units also a Numerical prefix (from Greek δέκα deci- (symbol d) is a prefix in the SI system of units denoting a factor of 10−1 (1/10 centi- (symbol c) is a SI prefix in the SI system of units denoting a factor of 10−2 or 1/100 "Milli" redirects here for the village in Azerbaijan see Birinci Milli; for similar-sounding words see Millie. micro- ( µ) is a prefix in the SI and other systems of units denoting a factor of 10&minus6 (one Millionth. nano- is a prefix (symbol n) in the SI system of units denoting a factor of 10−9 pico- (symbol p) is a prefix denoting a factor of 10-12 in the International System of Units (SI femto- is an SI prefix (symbol f) in the SI system of units denoting a factor of 10−15 or 0 atto- (symbol a) is an SI prefix to a unit and means that it is 10−18 times this unit zepto- (symbol z) is a prefix in the SI system of units denoting a factor of 10−21 yocto- (symbol y) is an SI prefix in the SI system of units denoting a factor of 10−24 or 0 To help compare different Orders of magnitude this page lists Lengths between 10&minus12 m and 10&minus11 m (1 pm and 10 pm An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol to form a Decimal multiple or The metric system is a decimalised system of measurement. It exists in several variations with different choices of base units, though the choice of base units does To help compare different Orders of magnitude, the following list describes various Lengths between 1 Conversion of units refers to conversion factors between different Units of measurement for the same Quantity.

References

1. ^ How Many? A Dictionary of Units of Measurement; Russ Rowlett and the University of North Carolina at Chapel Hill; http://www.unc.edu/~rowlett/units/dictB.html