Question

to convert water into ice , is pressure and temperature both needed if no , then if we compress water (water moleculescome close to each other) and can convert into ice?

Answer 1

Yes, both temperature and pressure are important for conversion of state.

If we compress a liquid, i.e. increase pressure, it can be converted into solid.
However, this is not true in case of water. Water is more denser in its liquid form than solid form, ice.