Submitted by schematicboy t3_10qtvtb in askscience
jrandoboi t1_j7a9apl wrote
Reply to comment by stu54 in Suppose I have a container of water with a ball floating on top of it. I put it outside overnight and the water freezes. Since the water's volume increases as it freezes, the ball is raised. Where does the increased gravitational potential energy come from? by schematicboy
Oh, so that's why water heats up slightly when it freezes... I could never quite understand that, thanks kind stranger
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