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This is the same bottle as in the previous picture, but this time it was sealed while at sea level and taken up to the mountaintop, where the air pressure is less. You can't see it very well but the dimples in the bottle's bottom were beginning to push out, making it lean slightly. Otherwise it looks almost normal - these things are apparently designed to withstand high internal pressures, but not external ones.

words & images ©  Jonathan Marchant 2003-2004

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