<Dl> <Dd> R (T ρ) = M P (\ displaystyle R (T \, \ rho) = MP) </Dd> </Dl> <Dd> R (T ρ) = M P (\ displaystyle R (T \, \ rho) = MP) </Dd> <P> where T is thermodynamic temperature and M is molar mass . When R and M are taken as constant, then pressure P can stay constant as the density - temperature quadrant (ρ, T) undergoes a squeeze mapping . </P> <P> The adjective "isobaric" is derived from the Greek words ἴσος (isos) meaning "equal", and βάρος (baros) meaning "weight ." </P>

The amount of energy absorbed or released as heat by a system during a process at constant pressure