An
isochoric process, also called a
constant-volume process, an
isovolumetric process, or an
isometric process, is a
thermodynamic process during which the
volume of the
closed system undergoing such a process remains constant. An isochoric process is exemplified by the heating or the cooling of the contents of a sealed, inelastic container: The thermodynamic process is the addition or removal of heat; the isolation of the contents of the container establishes the closed system; and the inability of the container to deform imposes the constant-volume condition. The isochoric process here should be a quasi-static process.