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The International Prototype of the Kilogram (referred to by metrologists as the IPK or Le Grand K; sometimes called the ur -kilogram, [1][2] or urkilogram, [3] particularly by German-language authors writing in English [3][4]: 30 [5]: 64 ) is an object whose mass was used to define the kilogram from 1889, when it replaced the Kilogramme des ...
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10−34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and ΔνCs. — CGPM [6][7]
A number of units were used to measure mass. One rottolo was equal to 0.512 8 kg as it was defined by metric equivalent. [2] [3] Some other units are given below (Note: these units too were defined by metric equivalents): 1 oka = 2.5 rottolo = 1282 g 1 metical = 4.76 g 1 kharouba = 1 ⁄ 2560 oka 1 dram = 1 ⁄ 160 oka 1 termino = 1 ⁄ 128 oka
The mass of an object is a measure of the object’s inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s 2.
In addition to Poynting, measurements were made by C. V. Boys (1895) [23] and Carl Braun (1897), [24] with compatible results suggesting G = 6.66(1) × 10 −11 m 3 ⋅kg −1 ⋅s −2. The modern notation involving the constant G was introduced by Boys in 1894 [10] and becomes standard by the end of the 1890s, with values usually cited in the ...
The gram (10 −3 kg) is an SI derived unit of mass. However, the names of all SI mass units are based on gram, rather than on kilogram; thus 10 3 kg is a megagram (10 6 g), not a *kilokilogram. The tonne (t) is an SI-compatible unit of mass equal to a megagram (Mg), or 10 3 kg.
The metre, kilogram, second system of units, also known more briefly as MKS units or the MKS system, [1][2][3] is a physical system of measurement based on the metre, kilogram, and second (MKS) as base units. Distances are described in terms of metres, mass in terms of kilograms and time in seconds. Derived units are defined using the ...
A number of units were used to measure mass. One rottolo (pound) was equal to 0.448 kg. [1] [2] Some other units are given below: 1 okia (ounce) = 1 ⁄ 16 rottolo 1 frasla = 36 rottolo 1 gisla = 360 rottolo. [1] [2]