Passage of a thermodynamic system from an initial to a final state of thermodynamic equilibrium.

Below is the list of popular ideal Thermodynamic processes:

(1)	$\begin{array}{l}\displaystyle T(t) = {\rm const} \Leftrightarrow \frac{\partial T}{\partial t} = 0\end{array}$

Isobaric process

(2)	$\begin{array}{l}\displaystyle P(t) = {\rm const} \Leftrightarrow \frac{\partial P}{\partial t} = 0\end{array}$

Isochoric process

(3)	$\begin{array}{l}\displaystyle V(t) = {\rm const} \Leftrightarrow \frac{\partial V}{\partial t} = 0\end{array}$

Isentropic process

(4)	$\begin{array}{l}\displaystyle S(t) = {\rm const} \Leftrightarrow \frac{\partial S}{\partial t} = 0\end{array}$

Adiabatic process

(5)	$\begin{array}{l}\displaystyle \frac{\partial (Q^{\downarrow}-Q^{\uparrow})}{\partial t} = 0\end{array}$

All the above processes are idealized and the practical studies and engineering are dealing with approximations to these processes, like for example, Quasi-isothermal process.

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See also