Beurat: Béda antarrépisi
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[[Gambar:Weeghaak.JPG|thumb|100px|[[Timbangan pér]]]]
Dina [[élmu-élmu fisik]], '''beurat''' hartina [[ukuran]] [[gaya]] [[gravitasi]]onal anu niban ka hiji barang<ref name="Canada" />. Dina beungeut [[Marcapada]], [[gravitasi Bumi|gravitasi]] kurang leuwihna sarua (konstan),
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== Beurat jeung massa ==
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In modern scientific usage, however, weight and mass are fundamentally different quantities: mass is an intrinsic property of [[matter]], whereas weight is a ''force'' that results from the action of [[gravity]] on matter: it measures how strongly gravity pulls on that matter.
However, the recognition of this difference is, historically, a relatively recent development and in many everyday situations the word "weight" continues to be used when "mass" is meant. For example, we say that an object "weighs one kilogram", even though the kilogram is a unit of mass.
The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity is very simliar everywhere on the surface of the Earth. In such a constant gravitational field, the gravitational force exerted on an object (its weight) is [[Proportionality (mathematics)|directly proportional]] to its mass. So, if object A weighs, say, 10 times as much as object B, then object A's mass is 10 times that of object B. This means that an object's mass can be measured indirectly by its weight (for conversion formulas see [[#Conversion between weight (force) and mass|below]]). For example, when we buy a bag of sugar we can measure its weight (how hard it presses down on the scales) and be sure that this will give a good indication of the quantity that we are actually interested in, which is the mass of sugar in the bag.
Nevertheless, the Earth's gravitational field can vary by as much as 0.5%<ref>{{cite book
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| isbn = }} p.3480-3485</ref> at different locations on Earth (see [[Earth's gravity]]). These variations alter the relationship between weight and mass, and must be taken into account in high precision weight measurements that are intended to indirectly measure mass. To eliminate this variation, when the weight of objects is used in commerce, the value given is what they would weigh at a nominal [[Standard gravity|standard gravitational acceleration]] of 9.80665 m/s<sup>2</sup> (approx. 32.174 ft/s<sup>2</sup>) [[Spring scale]]s, which measure local weight, must be calibrated at the location at which they will be used to show this standard weight, to be legal for commerce.
The use of "weight" for "mass" also persists in some scientific terminology – for example, in the [[chemistry|chemical]] terms "atomic weight", "molecular weight", and "formula weight", can still be found rather than the preferred "[[atomic mass]]" etc.
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* objects are compared in different gravitational fields, such as away from the Earth's surface. For example, on the surface of the [[Moon]], gravity is only about one-sixth as strong as on the surface of the Earth. A one-kilogram mass is still a one-kilogram mass (as mass is an intrinsic property of the object) but the downward force due to gravity is only one-sixth of what the object would experience on Earth.
* locating the [[center of gravity]] of an object (although if the gravitation field is uniform, the center of gravity will coincide with the center of mass).
* an object is submersed in a fluid (for instance, a brick weighs less when placed in water, and helium balloon in the atmosphere appears to have negative weight).
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== Sensation of weight ==
{{see also|apparent weight}}
The weight force that we actually sense is not the downward force of gravity, but the [[normal force]] (an upward [[contact force]]) exerted by the surface we stand on, which opposes gravity and prevents us falling to the center of the Earth. This normal force, called the apparent weight, is the one that is measured by a spring scale.
For a body supported in a stationary position, the normal force balances the earth's gravitational force, and so apparent weight has the same magnitude as actual weight. (Technically, things are slightly more complicated. For example, an object immersed in water weighs less, according to a spring scale, than the same object in air; this is due to [[buoyancy]], which opposes the weight force and therefore generates a smaller normal. These and other factors are explained further under apparent weight.)
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