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compressibility : ウィキペディア英語版
compressibility

In thermodynamics and fluid mechanics, compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change.
:\beta=-\frac\frac
where ''V'' is volume and ''p'' is pressure.
==Definition==

The specification above is incomplete, because for any object or system the magnitude of the compressibility depends strongly on whether the process is adiabatic or isothermal. Accordingly isothermal compressibility is defined:
:\beta_T=-\frac\left(\frac\right)_T
where the subscript ''T'' indicates that the partial differential is to be taken at constant temperature
Isentropic compressibility is defined:
:\beta_S=-\frac\left(\frac\right)_S
where ''S'' is entropy. For a solid, the distinction between the two is usually negligible.
The minus sign makes the compressibility positive in the (usual) case that an increase in pressure induces a reduction in volume.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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