Sanakirja.org

(thermodynamics) Of or pertaining to a process that takes place at constant temperature

Figure 1. Several isotherms of an ideal gas on a p-V diagram, where p for pressure and V the volume.

(thermodynamics) Of or pertaining to a process that takes place at constant temperature

Figure 2. The purple area represents the work for this isothermal change.

(thermodynamics) Of or pertaining to a process that takes place at constant temperature

Figure 3. Isothermal expansion of an ideal gas. Black line indicates continuously reversible expansion, while the red line indicates stepwise and nearly reversible expansion at each incremental drop in pressure of 0.1 atm of the working gas.