Kilometers or kilometers (km), meters (m), decimeters (dm), centimeters (cm), millimeters (mm), microns (microns), nanometers (nm), picometers (pm) and femtometers (fm).

1, also known as km, is a unit of length, abbreviated as "km", and is usually used to measure the distance between two places. The common conversion relationship is as follows: 1 km (km) = 1 0,000m (m) = 1 00,000m (cm) =10,000mm (mm); 1.6 1 km = 1 mile.

2. The decimeter is one of the metric units of length, and 1 decimeter is equivalent to one tenth of 1 meter. The common conversion relationship is as follows: 1 decimeter = 0.000 1 kilometer (km) = 0. 1 meter (m) = 10 centimeter (cm) = 100 millimeter (mm).

3, cm

The unit conversion of centimeters is as follows:1cm =10 mm = 0.1decimeter = 0.0 1 m = 0.0000 1 km.

4, um

1mm is equivalent to one thousandth of 1mm (this means "milli"). The decimal relation is as follows:1mm = 0.1cm = 0.01decimeter = 0.001m = 0.000001km.

5. Micron

1 micron is equivalent to one millionth of 1 meter (which means "micro").

6. Nano

Sometimes it is called nanometer in atomic physics, that is, 10-9 meters (65438+ billionth of a meter).

7. Pimi

1 picometer is equivalent to one trillionth of 1 meter. Sometimes it is called a micron in atomic physics. The conversion relationship is as follows: 1 picometer =10-12m =0.00 1 nanometer (nm) =0.00000 1 micron (micron).

Related information:

In the international system of units, the standard unit of length is "meter", which is represented by the symbol "m". 1960 The 1st International Metrology Conference: "The length of the meter is equal to 1650763.73 times of the radiation wavelength passing between 2P 10 and 5d 1 levels of krypton -86 atoms in vacuum".

Generally speaking, "meter" is generally defined as the length of the distance traveled by light in the time interval of 1/299792458s in vacuum. The unit of length adopted in China is consistent with the international system of units, that is, "meter" is the legal unit of length measurement in China.