# meter (m)

The unit of length meter (m) was first defined by the French Academy of Sciences in 1790. One meter is equal to one ten-millionth of the distance between the equator and the North Pole, along a meridian. The final version of the original meter was made of platinum and was archived in the French National Archives.

The definitions changed slightly over the centuries. It was not until 1983 that the now valid version of a meter was derived from the speed of light in a vacuum. Namely, it is the distance that light travels in a time interval of 1/299,792,458 of a second.

The meter, one of the basic units of the System of Units( SI), is divided into 10 decimeters (dm) or 100 centimeters (cm), one centimeter into 10 millimeters (mm), one millimeter into 1,000 micrometers (µm), and one micrometer into 1,000 nanometers (nm), a unit used in the structural width ofchips.

In addition to the meter unit of length, there are other units of length used in Anglo-Saxon countries such as the mile, the yard, feet, or inches. One mile is equal to 1.609 km or 5,280 feet( ft). One meter is equal to 1.0936 yards, 3.28 feet, or 39.37 inches.