A gas is enclosed in a metal container with a movable piston on top. Heat is added to the gas by placing a candle flame in contact with the container's bottom. Which of the following is true about the temperature of the gas?
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In thermodynamics, an adiabatic expansion (such as pulling out a piston dramatically) results in a rise in temperature if heat is added to the system. The expansion leads to work being done, which increases internal energy and temperature.
The temperature must go up, if the piston remains stationary
The temperature must go up, if the piston is pulled out dramatically
The temperature must go up no matter what happens to the piston
The temperature must go down no matter what happens to the piston
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The Correct Option isB
Solution and Explanation
When heat is added to a gas, the gas particles gain kinetic energy, which increases the temperature. If the piston is pulled out dramatically (meaning the gas expands), the gas does work against the piston, which can lead to an increase in internal energy. In an adiabatic expansion, this would generally cause the temperature to increase. Since the problem states that heat is being added (and not lost), the temperature will increase as the piston is pulled out dramatically, because work is done by the gas as it expands.
Thus, the correct answer is (b), as pulling out the piston dramatically increases the temperature due to the work done by the gas.
