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A picometre (alternative picometer) (symbol pm) is a unit
Units of measurement

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day....
 of length
Length

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....
 in the metric system
Metric system

The metric system is an international decimalised systems of measurement, founded by France in 1791, that is the common system of Unit of measurement used by most of the world....
, equal to one trillionth (1/1,000,000,000,000) of a meter, which is the current SI
International System of Units

The International System of Units is the modern form of the metric system and is generally a system devised around the convenience of the number ten....
 base unit
SI base unit

The International System of Units defines seven dimensional analysis SI base units. All other physical units can be derived from these base units: these are known as SI derived units....
 of length. It can be written in scientific notation
Scientific notation

Scientific notation, also known as standard form or as exponential notation, is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation....
 as 1×10−12 m (scientific notation) or (engineering notation ) — both meaning .

It equals a millionth of a micrometer
Micrometer

A micrometer , sometimes known as a micrometer screw gauge, is a device used widely in mechanical engineering and machining for precisely measuring, along with other Metrology instruments such as Caliper#Dial calipers and Caliper#Vernier caliper....
 (formerly called a micron), and was formerly called micromicron, stigma, or bicron.






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A picometre (alternative picometer) (symbol pm) is a unit
Units of measurement

The definition, agreement and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day....
 of length
Length

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....
 in the metric system
Metric system

The metric system is an international decimalised systems of measurement, founded by France in 1791, that is the common system of Unit of measurement used by most of the world....
, equal to one trillionth (1/1,000,000,000,000) of a meter, which is the current SI
International System of Units

The International System of Units is the modern form of the metric system and is generally a system devised around the convenience of the number ten....
 base unit
SI base unit

The International System of Units defines seven dimensional analysis SI base units. All other physical units can be derived from these base units: these are known as SI derived units....
 of length. It can be written in scientific notation
Scientific notation

Scientific notation, also known as standard form or as exponential notation, is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation....
 as 1×10−12 m (scientific notation) or (engineering notation ) — both meaning .

It equals a millionth of a micrometer
Micrometer

A micrometer , sometimes known as a micrometer screw gauge, is a device used widely in mechanical engineering and machining for precisely measuring, along with other Metrology instruments such as Caliper#Dial calipers and Caliper#Vernier caliper....
 (formerly called a micron), and was formerly called micromicron, stigma, or bicron. The symbol µµ was once used for it. It is also a hundredth of an Ångström
Ångström

An ?ngstr?m or angstrom is an internationally recognized non-SI unit of length equal to 0.1 nanometre or 1 metres. It is sometimes used in expressing the sizes of atoms, lengths of chemical bonds and optical spectrum, and dimensions of parts of integrated circuits....
, an internationally recognized non-SI unit of length.

The picometer's length is of an order such that its application is almost entirely confined to particle physics
Particle physics

Particle physics is a branch of physics that studies the elementary particle constituents of matter and radiation, and the interactions between them....
 and quantum physics. A standard atom is between 60 and 600pm in diameter. Smaller units still may be used to describe smaller particles (some of which are the components of atoms themselves), such as hadron
Hadron

In particle physics, a hadron is a bound state of quarks. Hadrons are held together by the strong interaction, similarly to how molecules are held together by the electromagnetic force....
s and fermion
Fermion

In particle physics, fermions are subatomic particle which obey Fermi-Dirac statistics; they are named after Enrico Fermi. In contrast to bosons, which have Bose-Einstein statistics, only one fermion can occupy a quantum state at a given time; this is the Pauli Exclusion Principle....
 point particles.

See also

  • Metric system
    Metric system

    The metric system is an international decimalised systems of measurement, founded by France in 1791, that is the common system of Unit of measurement used by most of the world....
  • Orders of magnitude (length)
    Orders of magnitude (length)

    To help compare different orders of magnitude, the following list describes various lengths between 1.6 m and 1.3 m.|}Detailed List...
  • Conversion of units
    Conversion of units

    Conversion of units refers to conversion factors between different units of measurement for the same quantity....
    , for comparison with other units of length.