Mass

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Mass 

The Standard Kilogram

The SI standard of mass is a platinum-iridium cylinder (Fig. 1-4) kept at the International Bureau of Weights and Measures near Paris and assigned, by international agreement, a mass of 1 kilogram. Accurate copies have been sent to standardizing laboratories in other countries, and the masses of other bodies can be determined by balancing them against a copy. Table 1-5 shows some masses expressed in kilograms, ranging over about 83 orders of magnitude.

The international! kg standard of mass, a platinum-iridium cylinder 3.9 cm in height and in diameter

The international! kg standard of mass, a platinum indium cylinder 3.9 cm in
height and in diameter

 

 

 

 

 

 

 

 

 

 

 

The U.S. copy of the standard kilogram is housed in a vault at NIST. It is
removed, no more than once a year, for the purpose of checking duplicate copies that are used elsewhere. Since 1889, it has been taken to France twice for recomparison with the primary standard.

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