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The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer ( American spelling) is a unit of length in the International System of Units (SI), equal to 1 × 10−12 m, or one trillionth ( 1 1 000 000 000 000) of a metre, which is the SI base unit of length.
A picosecond (abbreviated as ps) is a unit of time in the International System of Units (SI) equal to 10 −12 or 1⁄1 000 000 000 000 (one trillionth) of a second. That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds. A picosecond is to one second as one second is to approximately 31,689 years.
The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). [ 1][ 2] It is equal to the electric charge delivered by a 1 ampere current in 1 second and is defined in terms of the elementary charge e, at about 6.241 509 × 1018 e. [ 2][ 1]
Imperial units. 0.224809 lbf. The newton (symbol: N) is the unit of force in the International System of Units (SI). It is defined as , the force which gives a mass of 1 kilogram an acceleration of 1 metre per second squared. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically his second law of motion .
The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI), equivalent to 1 coulomb per volt (C/V). [ 1] It is named after the English physicist Michael Faraday (1791–1867). In SI base units 1 F = 1 kg −1 ⋅ m −2 ⋅ s 4 ⋅ A 2 .
It was only in 1960, when the metre was redefined in the same way, that the angstrom became again equal to 10 −10 metre. Yet the angstrom was never part of the SI system of units, [ 13 ] [ 14 ] and has been increasingly replaced by the nanometre ( 10 −9 m) or picometre ( 10 −12 m).
The curie (symbol Ci) is a non- SI unit of radioactivity originally defined in 1910. According to a notice in Nature at the time, it was to be named in honour of Pierre Curie, [ 1] but was considered at least by some to be in honour of Marie Curie as well, [ 2] and is in later literature considered to be named for both. [ 3]
Micro ( Greek letter μ, mu, non- italic) is a unit prefix in the metric system denoting a factor of 10 −6 (one millionth ). [ 1] Confirmed in 1960, the prefix comes from the Greek μικρός ( mikrós ), meaning "small". It is the only SI prefix which uses a character not from the Latin alphabet. In Unicode, the symbol is represented by U+ ...