Measure of the relative pressure change due to a temperature change
In thermodynamics, thermal pressure (also known as the thermal pressure coefficient) is a measure of the relative pressure change of a fluid or a solid as a response to a temperature change at constant volume. The concept is related to the Pressure-Temperature Law, also known as Amontons's law or Gay-Lussac's law.[1]
In general pressure, () can be written as the following sum: .
is the pressure required to compress the material from its volume to volume at a constant temperature . The second term expresses the change in thermal pressure . This is the pressure change at constant volume due to the temperature difference between and . Thus, it is the pressure change along an isochore of the material.
The thermal pressure is customarily expressed in its simple form as
^"CHEMISTRY, CHAPTER 9, 9.2 RELATING PRESSURE, VOLUME, AMOUNT, AND TEMPERATURE: THE IDEAL GAS LAW". Press Books. Retrieved 2020-10-17.
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