Thermodynamic Equilibrium Definition

- May 01, 2020-

Thermodynamic equilibrium definition

Regardless of whether the system is completely isolated from the environment, if the properties in the system do not change with time, the system is in a thermodynamic equilibrium state, which is macroscopically static. Every molecule in the microcosm is constantly moving, so it is also called dynamic equilibrium or thermal equilibrium.

When there is no phase change and no chemical change in the system, the internal temperature and pressure of the system are required to be the same everywhere, and there is no diffusion phenomenon; when there is a phase change in the system, it is required that the composition and quantity of each phase do not change with time when reaching equilibrium; When the chemical changes, it is required that the composition of the system does not change with time after reaching equilibrium.