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Isobaric process

p-V graph showing a different thermodynamic processes (1: isothermal, 2: isochoric, 3: isobaric, 4: adiabatic).
p-V graph showing a different thermodynamic processes (1: isothermal, 2: isochoric, 3: isobaric, 4: adiabatic).

In an isobaric process the pressure is kept constant (i.e. $$\Delta p=0$$). The work done by the gas is given by $$p\Delta V$$.

The change in internal energy during an isobaric process is given by $$\Delta U=Q-p\Delta V$$.

The p-V graph of an isobaric process is a horizontal line.

$$p=$$pressure; $$Q=$$heat supplied; $$T=$$temperature; $$\Delta U=$$change in internal energy; $$V=$$volume; $$W=$$work done