The kilogram, symbol kg, is the SI unit of mass. The formal definition according to the General Conference on Weights and Measures (CGPM) is: which when combined with the metre and second, defines the mass of the kilogram. the speed of light c, which when combined with the second, defines the length of the metre,.a specific atomic transition frequency Δ ν Cs, which defines the duration of the second,.The kilogram is defined in terms of three fundamental physical constants: In 1889, a cylinder of platinum-iridium, the International Prototype of the Kilogram (IPK), became the standard of the unit of mass for the metric system and remained so for 130 years, before the current standard was adopted in 2019. In 1799, the platinum Kilogramme des Archives replaced it as the standard of mass. The current definition of a kilogram agrees with this original definition to within 30 parts per million. The kilogram was originally defined in 1795 during the French Revolution as the mass of one litre of water. This allows a properly equipped metrology laboratory to calibrate a mass measurement instrument such as a Kibble balance as the primary standard to determine an exact kilogram mass. The kilogram is defined in terms of the second and the metre, both of which are based on fundamental physical constants. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially. The kilogram (also kilogramme ) is the base unit of mass in the International System of Units (SI), having the unit symbol kg.
Kilo gram conversion series#
A series of 5, 2, 1, 0.5 and 0.2 kilogram mass, made out of rusty cast iron
0 kommentar(er)
