But Really ...
Water doesn't behave like any other chemical. We've discussed before the various ways that you can make water do magic, and these things are possible only because water is a maverick that plays by its own rules. It would likely wear a sexy leather jacket, if we could get the bastard to stay in form long enough.
For example, a very simple principle of matter is that a liquid fills less volume when it freezes into a solid. That's because the molecules are closer together, which is why it gets hard (although strangely, ladies, if we get closer together and something gets hard, the volume only goes up). But water, unlike anything else, actually expands when it freezes, as you'll know if you've ever had a beer explode in the freezer after forgetting about it. This is why ice cubes float -- unlike any other substance, the frozen version is lighter and less dense than the liquid version.
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Much to the Titanic's dismay.
Why? Nobody knows. It's been a mystery to science ever since Science first graduated from Science School. There are complicated theories, but none of them are a slam dunk. In fact, despite the fact that water is the most ubiquitous substance, we know embarrassingly little about it. Why is ice slippery? f**k if science knows that one either.