Isothermal

In thermodynamics, an isothermal process is a type of thermodynamic process in which the temperature of the system remains constant: ΔT = 0. This typically occurs when a system is in contact with an outside thermal reservoir, and the change in the system will occur slowly enough to allow the system to continue to adjust to the temperature of the reservoir through heat exchange (see quasi-equilibrium). In contrast, an adiabatic process is where a system exchanges no heat with its surroundings (Q = 0).
Simply, we can say that in isothermal process




T
=

constant



{\displaystyle T={\text{constant}}}





Δ
T
=
0


{\displaystyle \Delta T=0}





d
T
=
0


{\displaystyle dT=0}

For ideal gases only, internal energy



Δ
U
=
0


{\displaystyle \Delta U=0}
while in adiabatic processes:




Q
=
0.


{\displaystyle Q=0.}

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