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Kilogram
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The kilogram is the base unit of mass in the International System of Units (SI), having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially. It means 'one thousand grams'.
A series of 5, 2, 1, 0.5 and 0.2 kilogram weights, made out of rusty cast iron
A series of 5, 2, 1, 0.5 and 0.2 kilogram weights, made out of rusty cast iron
The International Prototype of the Kilogram, whose mass was defined to be one kilogram from 1889 to 2019.
The International Prototype of the Kilogram, whose mass was defined to be one kilogram from 1889 to 2019.
A Kibble balance, which was originally used to measure the Planck constant in terms of the IPK, can now be used to calibrate secondary standard weight
A Kibble balance, which was originally used to measure the Planck constant in terms of the IPK, can now be used to calibrate secondary standard weights for practical use.
Kibble balance
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A Kibble balance is an electromechanical measuring instrument that measures the weight of a test object very precisely by the electric current and voltage needed to produce a compensating force. It is a metrological instrument that can realize the definition of the kilogram unit of mass based on fundamental constants.
The NIST-4 Kibble balance, which began full operation in early 2015, measured the Planck constant to within 13 parts per billion in 2017, which was ac
Precision Ampere balance at the US National Bureau of Standards (now NIST) in 1927. The current coils are visible under the balance, attached to the r
Precision Ampere balance at the US National Bureau of Standards (now NIST) in 1927. The current coils are visible under the balance, attached to the right balance arm. The Kibble balance is a development of the Ampere balance.
The local gravitational acceleration g is measured with exceptional precision with the help of a laser interferometer. The laser's pattern of interfer
The local gravitational acceleration g is measured with exceptional precision with the help of a laser interferometer. The laser's pattern of interference fringes—the dark and light bands above—blooms at an ever-faster rate as a free-falling corner reflector drops inside an absolute gravimeter. The pattern's frequency sweep is timed by an atomic clock.