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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 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.
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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.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. Comings, E. W. (1940). "English Engineering Units and Their Dimensions". Industrial & Engineering Chemistry. 32 (7): 984–987. doi: 10.1021/ie50367a028. 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 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-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.
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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. 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. SI coherent derived units involve only a trivial proportionality factor, not requiring conversion factors.Translated into English as the 'ounce,' King Offa, who lived at the end of the 8th century, accepted the silver ounce but then ran short of silver. The Dirhem was halved to 222 grains for the penny, twenty of which made the ounce as before, and twelve ounces the pound in silver. 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 ] kgf" redirects here. For other uses, see KGF (disambiguation). "Kilopond" redirects here. Not to be confused with Kilopound. kilogram-force
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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. A CD or DVD is 12 centimeters (120 millimeters) across. The diameter of the center hole is 15 millimeters. Newton metre is the unit of moment in the SI system. Its symbol is N m or N·m. It is a compound unit of torque corresponding to the torque from a force of 1 newton applied over a distance arm of 1 metre. 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. 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.
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In 1795 metric measurement systems were introduced in France and the gram was defined as "the absolute weight of a volume of pure water equal to a cube of one hundredth of a metre, and at the temperature of the melting ice".
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