The Kilogram (kG) is the base unit of mass in the International System (SI) of Units that is the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10^-34. Gram (G) equals to one-thousandth (10^-3) Kilogram (kG); Milligram (mG) is 10^-6 of a Kilogram (kG).
Reference Definition by NIST: At the end of the 18th century, a kilogram was the mass of a cubic decimetre of water. In 1889, the 1st CGPM (General Conference on Weights and Measures) sanctioned the international prototype of the kilogram, made of platinum-iridium, and declared: This prototype shall henceforth be considered to be the unit of mass. The picture at the right shows the platinum-iridium international prototype, as kept at the International Bureau of Weights and Measures under conditions specified by the 1st CGPM in 1889. The 3rd CGPM (1901), in a declaration intended to end the ambiguity in popular usage concerning the word “weight,” confirmed that: The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. One kilogram approximately equal to 2.2046 avoirdupois pounds.
Related Definitions in the Project: The Property and Unit
