369645
The gas in a refrigerator causes cooling on expansion because
1 Work done by the gas is converted into heat
2 Heat of the gas is lost as work done by the gas
3 The heat is spread over a large space
4 None of the above
Explanation:
Imagine the gas was in a cylinder and expanded by pushing against a piston. The movement would involve work being done. This work would need energy, which would come from the kinetic energy of the gas molecules hitting the piston- reducing their average speed. Taking KE away corresponds to lowering the temperature of the gas.