Prior to the current definition, the kilogram was defined as being equal to the mass of a physical prototype, a cylinder made of a platinum-iridium alloy, which was an imperfect measure. The kilogram was originally defined as the mass of one liter of water at its freezing point in 1794, but was eventually re-defined, since measuring the mass of a volume of water was imprecise and cumbersome.Ī new definition of the kilogram was introduced in 2019 based on Planck's constant and changes to the definition of the second. This is at least in part due to the inconsistencies and lack of coherence that can arise through use of centimeter-gram-second systems, such as those between the systems of electrostatic and electromagnetic units. SI is a system based on the meter-kilogram-second system of units rather than a centimeter-gram-second system.
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Unlike the other SI base units, the kilogram is the only SI base unit with an SI prefix. History/origin: The name kilogram was derived from the French "kilogramme," which in turn came from adding Greek terminology meaning "a thousand," before the Late Latin term "gramma" meaning "a small weight." The changes were intended to improve the definitions of SI base units, not to actually change how the units are used throughout the world. Even though the definition of the kilogram was changed in 2019, the actual size of the unit remained the same. The meter and the second are defined in terms of c, the speed of light, and cesium frequency, Δ νCs.
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It is currently defined based on the fixed numerical value of the Planck constant, h, which is equal to 6.62607015 × 10 -34 in the units of J Use the above calculator to input pounds and optional ounces for results in kg and optional grams.Please provide values below to convert kilogram to pound, or vice versa.ĭefinition: A kilogram (symbol: kg) is the base unit of mass in the International System of Units (SI). Pounds to kilos FAQ Pounds to kg converter The lower half will display how many kilograms are equivalent to your weight as well as any leftover grams. Simply enter your weight measurement in either pounds or ounces (either lb., oz., or both) on the top line of our conversion table below and click "Get Results." If you're looking for a quick and easy way to convert pounds into kilograms or grams, we've got the solution. 290 pounds to kilograms ~= 131, 300 pounds to kilograms ~= 136.260 pounds to kilograms ~= 117, 270 pounds to kilograms ~= 122, 280 pounds to kilograms ~= 127.230 pounds to kilograms ~= 104, 240 pounds to kilograms ~= 108, 250 pounds to kilograms ~= 113.200 pounds to kilograms ~= 90, 210 pounds to kilograms ~= 95, 220 pounds to kilograms ~= 99.170 pounds to kilograms ~= 77, 180 pounds to kilograms ~= 81, 190 pounds to kilograms ~= 86.140 pounds to kilograms ~= 63, 150 pounds to kilograms ~= 68, 160 pounds to kilograms ~= 72.110 pounds to kilograms ~= 49, 120 pounds to kilograms ~= 54, 130 pounds to kilograms ~= 58.90 pounds to kilograms = 40 and 823 g, 100 pounds to kilograms = 45 and 359 g.70 pounds to kilograms = 31 and 751 g, 80 pounds to kilograms = 36 and 287 g.
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50 pounds to kilograms = 22 and 680 g, 60 pounds to kilograms = 27 and 216 g.30 pounds to kilograms = 13 and 608 g, 40 pounds to kilograms = 18 and 144 g.1 pound to grams = 454 g, 10 pounds to kilograms = 4 and 536 g, 20 pounds to kilograms = 9 and 72 g.Pounds Kilograms and Grams unit of mass conversionġ pound = 453.592 grams = 0.453592 kilograms