[Jake.aprillia]

This is a question I have asked my self the last two years. I'm currently studying chemistry in high school and I constantly think about this. Can you pressurize water to make ice? In theory, from what I know, you can pressurize something and condense it. This will make the molecules become closer together and create a solid. But will it work? Or will the movement of the molecules prevent this from happening. If anyone has any info on this and help me get the idea out my head, it will be much appreciated 

[Borek]

Can you pressurize water to make ice?

Yes.

http://en.wikipedia.org/wiki/Ice#Phases

[student123]

as i know water has its maximum density at 4 °C. Ice has lower density than water and that is why it is floating on the water and fish can survive under it. if you compress water you (i think) wont make ice, because ice is less dense than water in liquid state and if something is compressed its density is going to be higher.

[student123]

Sorry when I reviewed slower I found out that its real that water can become in solid state with compressing. I am not a professional chemist so i can't  decide how something works. and i didn't know what does this graph really show and how person would read it.

[Borek]

Your initial idea was perfectly logical, the only problem is - phase diagram for water is quite complicated. So when you take an ice cube at 0°C and you increase pressure, ice will first melt, than it will solidify back, but into different form of ice.

[student123]

and what is that form of ice what is the difference between normal and that form of ice

[student123]

whose idea was logical

[Borek]

The logic behind your statement

if you compress water you (i think) wont make ice, because ice is less dense than water in liquid state and if something is compressed its density is going to be higher.

is correct. It just doesn't take evrything into account.

and what is that form of ice what is the difference between normal and that form of ice

It is called "ice VI", it has different crystal structure than your normal ice.

Have you heard about two allotropes of carbon - graphite and diamond? These are different crystalline forms of the same element, but the idea is not limited to elements - it happens quite often for chemical compounds (just their different forms are not called allotropes, this is name reserved for pure elements).

[student123]

Does ice VI also have different look. Is its look like diffent too.

[Borek]

No idea how it looks, never seen it (and I am not sure if anyone have ever seen it).