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The kilogram is the weight of one liter of water. One thousandth of a kilogram is a gram. All multiples and submultiples of the base units are in powers of ten. Fractional units are not halves, but tenths, unlike the customary practice for fractions of inches, and derived units are related to the base units by multiples of powers of ten, unlike what is the case with twelve inches making a foot. Basing all units on multiples of ten makes conversion from one unit to another particularly easy.
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A CD or DVD is 12 centimeters (120 millimeters) across. The diameter of the center hole is 15 millimeters. The kilogram or kilogramme, (symbol: kg) is the SI base unit of mass. A gram is defined as one thousandth of a kilogram. Conversion of units describes equivalent units of mass in other systems. Balancing wheel tension with the TM-1 Spoke Tension Metre". Cyclingnews . Retrieved 2013-09-03. The recommended tension for spokes in bicycle wheels can be as low as 80 Kilograms force (Kfg) and as high as 230 Kilograms force. Author=Park Tool
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Multiplied units often turn up in "double proportion" situations, where a particular quantity is proportional to multiple dependent variables. To take a deliberately non-physics example, a difficult task might need either many people to work on it or people to work on it for a long time, so its difficulty is proportional to both the number of workers and the time spent and could thus be measured in "person-days". A six person-day job would require two people to work for three days to complete it, or three for two days, or whatever. (The validity or otherwise of the model in which these two working schemes are equivalent is left as an exercise for the reader!) For the Arabs, a silver Dirhem was determined by 45 full grown barley grains. Ten Dirhems made a Wukryeh of 450 grains, which we call an ounce from the Latin "uncia" or twelfth, which name is used genetically for such a class of weight or volume. There are 1000 liters in a cubic meter, so the mass of 1 cubic meter of water is approximately 1000 kilograms or 1 metric ton. Comings, E. W. (1940). "English Engineering Units and Their Dimensions". Industrial & Engineering Chemistry. 32 (7): 984–987. doi: 10.1021/ie50367a028. Early Babylonian and Egyptian records, as well as the Bible, indicate that weight was originally measured by the capacities of containers such as gourds or clay or metal vessels. These were filled with plant seeds that were then counted to measure the volumes. With the development of scales as a means of weighing, seeds and stones served as standards. For instance, the "carat," still used as a mass unit for gems, is derived from the carob seed.
Kilogram-force - Wikipedia Kilogram-force - Wikipedia
The kilogram-force has never been a part of the International System of Units (SI), which was introduced in 1960. The SI unit of force is the newton. The Greeks used the same weight measurement as the Babylonians, but the Romans changed it. Their basic unit of weight was the 'uncia,' from which the English word 'ounce' is originally derived. The uncia is a twelfth part of the 'pes,' which is the Roman 'foot —' our word inch is also derived from 'uncia.' The Romans used the same word for ounce, which they measured using a technique taken from the Arabs.Until 1995, the SI classified the radian and the steradian as supplementary units, but this designation was abandoned and the units were grouped as derived units. [3] See also [ edit ] Klinkenberg, Adrian (1969). "The American Engineering System of Units and Its Dimensional Constant g c". Industrial & Engineering Chemistry. 61 (4): 53–59. doi: 10.1021/ie50712a010. Resolution 7 of the 9th meeting of the CGPM (1948)". Archived from the original on 2020-06-22 . Retrieved 2021-03-02. The kilogram is the base unit of mass in the International (SI) System of Units, and is accepted on a day-to-day basis as a unit of weight (the gravitational force acting on any given object). The kilogram-meter per second (kg · m/s or kg · m · s -1 ) is the standard unit of momentum . Reduced to base units in the International System of Units ( SI ), a kilogram-meter per second is the equivalent of a newton-second (N · s), which is the SI unit of impulse. Although the units are the same in base terms, there is a conceptual difference between momentum and impulse.
Kilogram-Meter per Second? - TechTarget What is a Kilogram-Meter per Second? - TechTarget
Some other units such as the hour, litre, tonne, bar, and electronvolt are not SI units, but are widely used in conjunction with SI units. kgf" redirects here. For other uses, see KGF (disambiguation). "Kilopond" redirects here. Not to be confused with Kilopound. kilogram-force The kilogram-force ( kgf or kg F), or kilopond ( kp, from Latin: pondus, lit.'weight'), is a non-standard gravitational metric unit of force. It does not comply with the International System of Units (SI) and is deprecated for most uses. The kilogram-force is equal to the magnitude of the force exerted on one kilogram of mass in a 9.806 65m/s 2 gravitational field ( standard gravity, a conventional value approximating the average magnitude of gravity on Earth). [1] That is, it is the weight of a kilogram under standard gravity. Therefore, one kilogram-force is by definition equal to 9.806 65 N. [2] [3] Similarly, a gram-force is 9.806 65mN, and a milligram-force is 9.806 65μN. The SI has special names for 22 of these coherent derived units (for example, hertz, the SI unit of measurement of frequency), but the rest merely reflect their derivation: for example, the square metre (m 2), the SI derived unit of area; and the kilogram per cubic metre (kg/m 3 or kg⋅m −3), the SI derived unit of density. Kilogram-force is a non-standard unit and is classified in the International System of Units (SI) as a unit that is not accepted for use with SI. [4] History [ edit ]
The metric system was not particularly popular in revolutionary France, and Emperor Napoleon, who came just after the Revolution, abolished it. But, when Napoleon lost power, the system was reinstated. Metric weights have a very different history. Metric weights, the gram, the kilogram, were developed by scientists in 18th century France. In 1791, the French parliament imposed the use of the metric system on the country, and it is now used in Continental Europe and many other parts of the world. The gram-force and kilogram-force were never well-defined units until the CGPM adopted a standard acceleration of gravity of 9.80665m/s 2 for this purpose in 1901, [5] though they had been used in low-precision measurements of force before that time. Even then, the proposal to define kilogram-force as standard unit of force was explicitly rejected. [6] Instead, the newton was proposed in 1913 [7] and accepted in 1948. [8] Harman, George G. (2010). Wire Bonding in Microelectronics (3rded.). New York: McGraw-Hill. p.408. ISBN 978-0-07-164265-1. OCLC 609421363. Breaking load (BL): The strength of a wire and its actual force (usually given in grams, grams-force, mN, etc.) required to break a particular wire in a tensile pull. It is not tensile strength, which by definition is the force per unit area.
Kilograms conversion calculators, tables and forumas
SI coherent derived units involve only a trivial proportionality factor, not requiring conversion factors. Although there's no precise standard for doorknob heights, they're often about 1 meter above the floor.
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The kilogramme (derived from the Greek chilioi [thousand] and gramma [a small weight] was named as a more practical measure of mass for larger quantities in trade, and came to be used as the base unit of mass in all metric measurement systems.
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