"m/m" (mètre) is the basic unit of length in the international system of units, with the symbol m, and one meter is equal to 10 decimeter. It can be used to measure length, width and height.

The units of length are millimeters, centimeters, decimeters, meters and kilometers.

1000 m = 1 km

1 m = 10 decimeter =100 cm =1000 mm.

1 decimeter =10cm =100mm

1 cm = 10/0mm

As long as the progress rate between units is memorized, it can be converted correctly.

The origin of rice

The unit of length "meter" in the international system of units originated in France.

1790 in may, a special Committee composed of French scientists suggested that one fortieth of the total length of the meridian of the earth passing through Paris should be used as the unit of length-meter.

1799 According to the measurement results, a platinum rice bar with a rectangular section of 3.5 mm (mm) ×25 mm was made, and the distance between the two ends of the bar was set as 1 m, which was kept by the French Archives Bureau, so it was also called "archival rice". This is the earliest definition of rice.

Due to the serious deformation of the archival meter, the definition of "archival meter" was abandoned in 1872, and the meter made of the original platinum alloy was used as the length unit instead.