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Al-Biruni did not know that in ice, each water molecule is typically linked with four others through hydrogen bonding, forming an ordered crystal structure whereas in its liquid state, these hydrogen bonds break and reform on a picosecond time scale, allowing a statistical distribution of the different possible coordinations. Each large ring contains three or four different chemical groups, or stations, where the small rings are temporarily held in place by hydrogen bonding. This does not take into account hydrogen bonding or more importantly crystallinity (polyethylene is very crystalline). |
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