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Rpanich t1_jaad1jk wrote

The ice cube freezes from the outside in, and water also expands as it freezes, so it has nowhere to go but up.

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Rpanich t1_jaadtmn wrote

Just looked it up; so it appears that it has to do with how ice molecules crystallise, air temptation, and the rate of cooling: the spikes form at 60 degree angles and it optimally requires about -7 degrees Celsius. If not it can freeze in more of a “sheet like” pattern which rapidly covers the surface.

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