Measures

Measures, defined physical quantities with which other quantities are compared for the purpose of measuring them. The basic measures of the most common metric system are: the meter—a length of the platinum rod at 0°, stored at the International Bureau of Weights and Measures in Paris; the kilogram—the mass of a platinum weight stored there; the second—a time equal to 1/86400 of the mean solar day. The metric system of measures was first introduced in France during the French Revolution. According to the thought of its creators, prototypes of the meter and kilogram were to serve natural quantities: 0.000025 of the length of the earth's meridian and the mass of 0.001 cubic meters of water at 0°, but over time it became clear that with increasing accuracy of measuring instruments, the definition of these measures would have to be constantly corrected. Therefore, it was decided to stop at the careful storage of conventional prototypes of the basic measures. Other measures are reduced to these basic ones, for example, the micron = 0.000001 meter, the hectare = 10,000 square meters, the liter = 0.001 cubic meter, the ton = 1,000 kilograms. The correctness of the samples of all measures in circulation is observed by the chambers of weights and measures.