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# Primary Standards & Exact/Derived 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

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

### Derived Conversions:

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 1 foot of H2O at 4°C = 2988.98 pascals 1 gram/cubic centimeter = 1000 kilograms/meter3 1 inch of H2O at 4°C = 249.082 pascals 1 inch of Hg at 0°C = 3386.389 pascals 1 pound F/in2 = 6894.7572 pascals 1 pound M/in3 = 27,679.905 kilograms/meter3 1 quart (U.S.) = 9.4635295 x 10-4 meter3 1 drop = 50 microliters 1 bar = 14.503774 pounds F/inch2