Expansion in Gases
For an ideal gas, the volumetric thermal expansion (i.e., relative change in volume due to temperature change) depends on the type of process in which temperature is changed. Two known cases are isobaric change, where pressure is held constant, and adiabatic change, where no work is done and no change in entropy occurs.
In an isobaric process, the volumetric thermal expansivity, which we denote, is given by the ideal gas law:
The index denotes an isobaric process.
Read more about this topic: Thermal Expansion
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