"meter" (meter), the basic unit of length in the international system of units, with the symbol M, can be used to measure length, width and height.

Rice is also called "rice" The definition of rice originated in France. The length of one meter was originally defined as one tenth of the distance from the equator of the earth to the North Pole through the Paris noon line, and then the international rice origin was determined. With the deepening of people's understanding of measurement, the definition of the length of meter has been revised many times.

From 1983, the length of meter is defined as "the distance that light travels in vacuum in 1/299 792 458 seconds". One meter, the distance that light travels in vacuum is within 1/299 792 458 seconds.

Extended data:

The development course of "rice";

1688, John Wilkins, a British philosopher and priest, put forward the need for a standard decimal length unit system.

1675, the Italian scientist Ti Tuo livio Bratini first used the word metro cattolico in his paper, which originated from the Greek μ? τρον καθολικ? ν(métron katholikón), which means "universal unit of measurement".

1789 After the victory of the French Revolution, the National Assembly ordered the French Academy of Sciences to set up a committee, the unified measurement System.

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