My roommate had an interesting experience with her drink today. She had a metal thermos filled with water, and she had placed it in the freezer a few days ago. When she got it out today, the metal had changed shape. The bottom of the thermos had expanded. What happened was the following: the water expanded when it froze, it is one of the special properties that water has. When frozen it expands its volume, thus pushing the metal out and making the thermos change its shape!
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