Hi guys!!!! i'm a high school student in korea. I was doing homework then, i found that i couldnt understand sth. When i pull a rubber band, that will make rubber molecules equall but also make them hot. The problem said 'the entalpy of rubber band when you didnt pull has higher entalpy than you pulled' Buttttt i think that i worked to the band, so the heat was from work. It cant define the higher entalpy because of release of heat. Did i wrong?