An isobaric process is a thermodynamic process in which the pressure remains constant while the volume and temperature of a system change. This type of process is often represented on a pressure-volume (PV) diagram as a horizontal line, indicating that pressure does not vary as the system undergoes changes. In an isobaric process, when heat is added to a gas, it expands, doing work on its surroundings. Conversely, if heat is removed, the gas contracts. Common examples of isobaric processes include the heating of a gas in a piston where the pressure is maintained constant, such as in steam engines or refrigeration systems.