エンタルピー entropy

Overview

Enthalpy ($H$) and entropy ($S$) are fundamental thermodynamic properties used to analyze energy transfer and process efficiency.

Key Formulas

Enthalpy

$H = U + PV$

Total heat content of a system.

Entropy

$dS = \frac{\delta Q_{rev}}{T}$

Measure of irreversibility.

Gibbs Free Energy

$G = H - TS$

Maximum non-expansion work.

Helmholtz Free Energy

$A = U - TS$

Maximum work at constant volume.

Variables

Reference Data

References

• Original Source