What are the variables for this piston? temperature only temperature and volume pressure and number of molecules volume and number of molecules

Option 2: temperature and volume

Explanation:

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When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.