Metrology
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Metrology is the scientific study of measurement. It establishes a common understanding of units, crucial in linking human activities. Modern metrology has its roots in the French Revolution's politic
The NIST-4 Kibble balance, which is used to measure weight via electric current and voltage. With this instrument, the measurement of mass is no longer dependent on a defined mass standard and is instead dependent on natural physical constants.
Computer-generated image realising the international prototype of the kilogram (IPK), made from an alloy of 90-per cent platinum and 10-per cent iridium by weight
Ohm
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The ohm is the unit of electrical resistance in the International System of Units. It is named after German physicist Georg Ohm. Various empirically derived standard units for electrical resistance we
A laboratory one-ohm standard resistor, c. 1917
One of the functions of many types of multimeters is the measurement of resistance in ohms.