▲ 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".
▲ Other length units include: light years, astronomical units, meters (Pm), megameters (Mm), kilometers (km), decimeters (dm), centimeters (cm), millimeters (mm), silk rice (dmm), millet (cmm), micron (micron) and nanometer (nm). Their conversion relationship with rice is as follows:
1ym =1×10 24m (Yao Mi)
1zm = 1× 10 2 1m(zemi)
1em =1×1018m (Amy)
1ly = 9.46×1015m (light years)
1pm =1×1015m (m)
1TM =1×1012m (too meters)
1GM =/kloc-0 /×10.9m (m)
1 mm = 1× 10 meter (megameter)
1 km =1x10 3m (km)
1hm =1×10m (100m)
1 dam = 1× 10 1m( 10m)。
1 m
1 decimeter = 1× 10 (- 1) meter (decimeter)
1 cm = 1x 10 (-2) meters (cm)
1 mm = 1× 10 (-3) meters (mm)
1DMM =1×10 (-4) meters (silk rice)
1 CMM = 1× 10 (-5) m (Mi Hu)
1μ m =/kloc-0 /×10 (-6) meters (microns)
1 nm = 1× 10 (-9) meter (nm)
1pm =1×10 (-12) meters (picometers)
1FM =1×10 (-15) meters (femtometers)
1am = 1× 10(- 18)m(Ami)
1zm =1×10 (-21) meters (meters)
1ym =1×10 (-24) meters (one meter)