People use ice packs to help them with injuries. Heat is involved with the bending of the pack because of the heat in your hand. That heat somewhat melts the middle of the pack when you break it. Heat is also involved because once the ice pack finishes being cold, it turns hot because the cold energy is gone. Again, heat from your hands and energy within the pack causes the ice pack to chemically react. That is how heat is involved.
Resource: www.ehow.com/how-does_4914813_how-ice-packs-work.html
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needs more details but good job
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