system
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human
Can water be compressed to a solid?

The 'normal' solid form of water is crystal, leading to a lot of 'negative' space and the common trivia about ice being more voluminous than liquid water.

It seems like though, the crystallization is almost just getting in the way of what could be a more normal (to other molecules) solidification process.  

So is it possible to either compress water until it's solid, or cool it in such a way that its viscosity increases to solid?
gpt
Keeping it at room temperature, you'd have to compress it to a pressure of about 10,000 atmospheres before it solidified. It wouldn't form regular ice, it would form something called Ice-VI with a different structure.