Likewise, volume may be thought of as transferred in a process in which there is a motion of the wall between two systems, increasing the volume of one and decreasing that of the other by equal amounts. For example, species of matter may be transferred through a semipermeable membrane. They are transferred across a wall between two thermodynamic systems or subsystems. In thermodynamics, some extensive quantities measure amounts that are conserved in a thermodynamic process of transfer. The density of water is approximately 1g/mL whether you consider a drop of water or a swimming pool, but the mass is different in the two cases.ĭividing one extensive property by another extensive property generally gives an intensive value-for example: mass (extensive) divided by volume (extensive) gives density (intensive).Įxamples of extensive properties include: The related intensive quantity is the density which is independent of the amount. For example, the mass of a sample is an extensive quantity it depends on the amount of substance. See List of materials properties for a more exhaustive list specifically pertaining to materials.Īn extensive property is a physical quantity whose value is proportional to the size of the system it describes, or to the quantity of matter in the system.
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