Primary Standards:

Primary Standards*

 Meter Length equal to 1,650,763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2 p10 and 5 d5 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 Sevres, 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 sec. per sec.

Exact Conversions*

 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

*Exact by National Bureau of Standards definition

Derived Conversions

 1 foot of H2O at 4°C = 2 988.98 pascals 1 gram/centimeter3 = 1 000 kilograms/meter3 1 inch of H2O at 4°C = 249.082 pascals 1 inch of Hg at 0°C = 3 386.389 pascals 1 pound F / inch2 = 6 894.7572 pascals 1 pound M / inch3 = 27,679.905 Kilograms/meter3 1 quart (U.S.) = 9.4635295 x 10-4 meter3 1 drop = 50 microliters 1 bar = 14.503774 pound F / inch2

The Lee Company, Industrial Microhydraulics Group • 82 Pequot Park Road, Westbrook, CT 06498-0424 • Tel: 860-399-6281 • Fax: 860-399-7037 • inquiry@TheLeeCo.com