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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 Δν Cs. —
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 unit is in common use for masses above about 10 3 kg and is often used with SI prefixes.
Established at 122 lb (55.3 kg) in 1920 by Walker Law; recognized in 1976 Super Flyweight: 112–115 lb (50.8 - 52.2 kg) Established at 115 lb (52.2 kg) in 1920 by Walker Law; recognized in 1980 Light Flyweight: 105–108 lb (47.6 - 49 kg) Established at 108 lb (49 kg) in 1920 by Walker Law; recognized in 1975 Strawweight: 105 lb (47.6 kg)
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1 kg = (299 792 458) 2 / (6.626 070 15 × 10 −34)(9 192 631 770) h Δν Cs / c 2 . All units in the SI can be expressed in terms of the base units, and the base units serve as a preferred set for expressing or analysing the relationships between units.
kg mass "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 ∆ν Cs." [1]
Distances are described in terms of metres, mass in terms of kilograms and time in seconds. Derived units are defined using the appropriate combinations, such as velocity in metres per second. Some units have their own names, such as the newton unit of force which is defined as kilogram times metres per second squared.
Weight class Upper weight limit Strawweight: 115 lb (52.2 kg) Flyweight: 125 lb (56.7 kg) Bantamweight: 135 lb (61.2 kg) Featherweight: 145 lb (65.8 kg)