Isothermal-isobaric process

In processes, isothermal-isobaric process is one that occurs at constant temperature (isothermal process) and constant pressure (isobaric process), meaning that the following differentials will result:

dT = 0
dP = 0

These conditions often facilitate thermodynamic calculations. In the case of typical in vivo processes (occurring inside of an organism), this condition is almost always assumed to hold; for typical in vitro processes, in situ processes, or earth bound processes, this condition is approximated to hold in first pass calculations; in more advanced analysis, variations in temperature and pressure need to be taken into account and a full derivation needs to be done from first principles (first main principle and second main principle). In the cases where the above criterion hold (dT=0, dP=0), or are approximated to hold, the Lewis inequality will govern the process. [1]

References
1. Reiss, Howard. Methods of Thermodynamics (pg. 78). Dover.

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