Primary Standards & Exact Conversions

Primary Standards per National Institute of Standards and Technology

Meter – Length equal to 1,650,763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p10 and 5d5 of the Krypton-86 atom.

Kilogram – Mass equal to the mass of the international prototype of the kilogram. This is a particular cylinder of platinum-iridium alloy which is preserved in a vault at Sèvres, France by the International Bureau of Weights and Measures.

Second – Time duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.

Derived Standard

Newton – Force which gives to a mass of 1 kilogram an acceleration of 1 meter per second per second.

Exact Conversions per National Institute of Standards and Technology
1 pascal
1 atmosphere
1 bar
1 centipoise
1 centistoke
1 fluid ounce (U.S)
1 foot
1 gallon (U.S.)
1 gram
1 inch
1 kilogram force
1 liter
1 micron
1 milliliter
1 ounce mass (avdp)
1 pound force (acvdp)
1 pound mass (avdp)
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1 newton/meter²
101,325 pascals
100,000 pascals
0.001 newton-second/meter²
1 x 10 meter²/second
2.95735295625E-5 meter³
0.3048 meter
3.785411784E-3 meter³
0.001 kilogram
0.0254 meter
9.80665 newtons
0.001 meter³
1E-6 meter
1E-6 meter³
0.028349523125 kilogram
4.4482216152605 newtons
0.45359237 kilogram

(note: 3.2E+3 = 3,200)

 

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