The prototype of one standard kilogram and one standard meter is kept under the one atmospheric pressure and zero degree celsius temperature in th international bureau of weight and measurements
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International Bureau of Weights and measures
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International Bureau of Weights and Measures (BIPM), French Bureau International des Poids et Mesures, international organization founded to bring about the unification of measurement systems, to establish and preserve fundamental international standards and prototypes, to verify national standards, and to determine
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