Pour some water into the can. When the water inside will boil tight, put down the hole can of vigorous movement of the cold water. Can wall collapse inward with a bang. The air inside the box as the temperature rises expands - its density decreases. The box is open, it leaves the excess air. When we put a can of cold water in the middle of the water vapor will condense, and since P / T = constant, the pressure inside it will decrease rapidly. The pressure at the outside of the can is much greater than in the middle and crush cans.
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