With the piston head locked in place, will the volume of the gas increase, decrease, or stay the same whenthe piston is placed above the flameThe volume increases. The volume decreases. The volume stays the same

For real gas the volume of a given mass of gas will increase with increase in temperature.

Explanation:

With the piston head locked in place and place above the fire, the volume of the gas will increase, because the volume of a given mass of gas increases with increase temperature.