Katy Perry - Love Me (Music Video)

In a closed system at room temperature comprising a tank containing 1 litre of air at 10 bars of pressure which is released to flow into a second, evacuated tank of 9 litres, the temperature of the tanks and the air will fall to below freezing. Heat energy is lost as well as the potential energy in the compressed air and the vacuum. Those forms of energy have been “destroyed” in carrying out the work of expanding the compressed air. There is no increase in kinetic, potential, heat, electromagnetic or any other form of energy. Einstein’s statement that energy cannot be destroyed appears to be mistaken. Here is an article that comes close to discussing this: https://www.physicsforums.com/threads/what-happens-to-energy-as-air-fills-a-vacuum.700152/