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Plastic bottles are 'blow molded'. Basically air is forced inside a small piece of hot plastic and it expands like a balloon, except that this 'balloon' is inside a form or mold in the shape of the bottle. It is cooled and the bottle shape stays. If the softening point of the bottle is lower than the hot liquid poured in, then the plastic 'balloon' wants to shrink again.

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12y ago
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12y ago

Because water freezes and expands then freezes again then expands some more leaving more water than it started of with every single time.

Devils marbles are a great example of what and how water can over come barriers.

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14y ago

I don't think it cracks I think it just warps the plastic... Like putting a paper plate in the microwave for too long.

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13y ago

Because water expands when it freezes. You can freeze a bottle of water without breaking it, but you have to leave about 1 1/2" of space at the top for the expansion that will take place.

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8y ago

Rapid contraction leads to the emergence of tensions in the glass and then to cracking.

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Q: If you heat a plastic bottle full of liquid why will it crack?
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