Question

The prototype of one standard kilogram and one standard meter is kept under the one atmospheric
pressure and zero degree Celsius temperature in the international bureau of weights and
measurement.

Answer 1

Answer:

The International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur-kilogram,[1][2] or urkilogram,[3] particularly by German-language authors writing in English[3][4]:30[5]:64) is an object that was used to define the magnitude of the mass of the kilogram from 1889, when it replaced the Kilogramme des Archives,[6] until 2019, when it was replaced by a new definition of the kilogram based on physical constants.[7] During that time, the IPK and its duplicates were used to calibrate all other kilogram mass standards on Earth.

Answer 2

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