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Extensive_quantity

# Extensive_quantity - Intensive and extensive properties...

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Intensive and extensive properties From Wikipedia, the free encyclopedia (Redirected from Extensive quantit y ) Jump to: navigation , search This article needs additional citations for verification . Please help improve this article by adding reliable references . Unsourced material may be challenged and removed . (April 2010) In the physical sciences , an intensive property (also called a bulk property , intensive quantity , or intensive variable ), is a physical property of a system that does not depend on the system size or the amount of material in the system: it is scale invariant . By contrast, an extensive property (also extensive quantity , extensive variable , or extensive parameter ) of a system is directly proportional to the system size or the amount of material in the system. For example, density is an intensive property of a substance because it does not depend on the amount of that substance; mass and volume , which are measures of the amount of the substance, are extensive properties. Note that the ratio of two extensive properties that scale in the same way is scale-invariant, and hence an intensive property.

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Contents 1 Intensi ve propert ies 1 . 1 C o m b i n e d i n t e n s i v e p r o p e r t i e s 1 . 2 J o i n i n g
[ edit ] Intensive properties An intensive property is a physical quantity whose value does not depend on the amount of the substance for which it is measured. For example, the temperature of a system is the same as the temperature of any part of it. If the system is divided, the temperature of each subsystem is identical. The same applies to the density of a homogeneous system, if divided in half, the mass and the volume change in the identical ratio and the density remains unchanged. According to the state postulate , for a sufficiently simple system, only two independent intensive variables are needed to fully specify the entire state of a system. Other intensive properties can be derived from the two known values. Some intensive properties, such as viscosity , are empirical macroscopic quantities and are not relevant to extremely small systems. [ edit ] Combined intensive properties There are four properties in any thermodynamic system, two intensive ones and two extensive ones. If a set of parameters, { a i }, are intensive properties and another set, { A j }, are extensive properties, then the function F ({ a i },{ A j }) is an intensive property if for all α, It follows, for example, that the ratio of two extensive properties is an intensive property - density (intensive) is equal to mass (extensive) divided by volume (extensive).

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[ edit ] Joining systems This section's factual accuracy is disputed . Please see the relevant discussion on the talk page . (February 2009) Let there be a system or piece of substance a of amount m a and another piece of substance b of amount m b which can be combined without interaction. [For example, lead and tin combine without interaction, but common salt dissolves in water and the properties of the resulting solution are not a simple combination of the properties of its constituents.] Let V be an intensive variable. The value
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