Friday, 28 June 2019

physical chemistry - Why water expands when freezes?



I'm sure this is for most of you a basic question, but it really puzzles me:


How it is that, even though all materials expand as they get warmer, and contract (maybe these are not the correct terms) when get colder, water exapands when freezes.


Thanks a lot.



Answer



The expansion upon freezing comes from the fact that water crystallizes into an open hexagonal form. This hexagonal lattice contains more space than the liquid state.


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