Discussion
Consider a piston-cylinder arrangement containing a gas. This system is heated by placing it on the top of a burner. The system undergoes
Answer: B
The system undergoes a constant pressure process.
A free piston is held in place by its own weight and the atmosphere above it, both of which are constant. As the burner heats the gas, the gas expands and pushes the piston up, but the pressure needed to support the piston stays the same, so the heating is at constant pressure.
It is not constant volume, because the piston moves. It is not adiabatic, because heat is being added from the burner. And it is not isothermal: the temperature rises as heat is added at constant pressure, in proportion to the volume for an ideal gas.
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