The kilogram, the standard unit of mass, is the only one of the seven key International System of Units (SI units) that is still based on a physical artifact. That item is a cylinder of ...
Unlike the other six base units of measurement (meter, second, ampere, kelvin, mole and candela), the kilogram is not currently a mathematical constant. Instead, the standard unit of mass is based on ...
A CIRCULAR recently issued by the United States Bureau of Standards* furnishes information concerning the verification of standards of mass and the most suitable forms of such standards for different ...
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