If I compress my bicycle pump just once, the air trapped inside the piston heats

Question

If I compress my bicycle pump just once, the air trapped inside the piston heats up (and it gets hot on the outside) and a small amount of air leaves the piston to inflate the bicycle tyre. Let the system be the space inside the piston of the pump. What types of energy transfer affect this system when I compress the pump as described? In each case say if energy goes in or out of the system. Is the system closed or open? If I compress my bicycle pump just once, the air trapped inside the piston heats up (and it gets hot on the outside) and a small amount of air leaves the piston to inflate the bicycle tyre. Let the system be the space inside the piston of the pump. What types of energy transfer affect this system when I compress the pump as described? In each case say if energy goes in or out of the system. Is the system closed or open?

Explanation / Answer

The type of energy transfer taking place when a pump is compressed is, the work done in compressing the pump as mechanical energy is converted to internal heat energy. This heat energy is pushing the outlet valve and the air is left to inflate the tyre. While pumping in the energy goes inside the system and while pulling out the energy goes out of the system. This is a closed system as the heat is released into a conditioned space and not in a surrounding space as like in open system.

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