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#Pounds to kilograms series#

Which revised the provisional system of units introduced by the French National Convention two years earlier, where the gravet had been defined as weight ( poids) of a cubic centimetre of water, equal to 1/1000 of a grave. The word kilogramme was written into French law in 1795, in the Decree of 18 Germinal, The word kilogramme or kilogram is derived from the French kilogramme, which itself was a learned coinage, prefixing the Greek stem of χίλιοι khilioi "a thousand" to gramma, a Late Latin term for "a small weight", itself from Greek γράμμα. The kilogram is the only base SI unit with an SI prefix ( kilo) as part of its name. 2019: The kilogram was defined in terms of the Planck constant, the speed of light and hyperfine transition frequency of 133Cs as approved by the General Conference on Weights and Measures (CGPM) on November 16, 2018.1875–1889: The Metre Convention was signed in 1875, leading to the production of the International Prototype of the Kilogram (IPK) in 1879 and its adoption in 1889.It had a mass equal to the mass of 1 dm 3 of water at the temperature of its maximum density, which is approximately 4 ☌. 1799: The Kilogramme des Archives was manufactured as a prototype.1795: the gram ( 1/ 1000 of a kilogram) was provisionally defined as the mass of one cubic centimetre of water at the melting point of ice.1793: The grave (the precursor of the kilogram) was defined as the mass of 1 litre (dm 3) of water, which was determined to be 18841 grains.

Timeline of previous definitions The International Prototype of the Kilogram, whose mass was defined to be one kilogram from 1889 to 2019. This definition is generally consistent with previous definitions: the mass remains within 30 ppm of the mass of one litre of water. 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.

#Pounds to kilograms series#

A series of 5, 2, 1, 0.5 and 0.2 kilogram mass, made out of rusty cast iron