There is air in the cylinder under the piston. When the air heats up, the piston moves up. What is the name of the equilibrium

There is air in the cylinder under the piston. When the air heats up, the piston moves up. What is the name of the equilibrium process of changing the state of a gas?

The process of changing the state of a thermodynamic system at constant pressure is called isobaric.

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