Water A molecule of water is as basic as
it gets—just an oxygen atom with two hydrogen atoms adhering to it. But
throw a jillion of them together, and voilà, you get a substance with characteristics that the individual molecules do not possess on their
own—liquidity, for instance. Emergent properties often beget emergent
behaviors, and those of water are no exception. Cool water down enough
and it becomes a solid, for instance; warm it up enough and it becomes a gas.