200 to 250 psi
Liquid.
i think this can be done by redusing the pressure..
By keeping it at an extremely low temperature (−183 °C) or at an extremely high pressure
Without atmospheric pressure, water will boil to vapour, so as our blood and body would explode. Pressure is what that keep water in liquid and solid state on earth.
Liquid
It will boil
This is because the coolant is often under high pressure, and to keep it in the liquid state you must have sealed pipes.
These factors are temperature and pressure.
Gas is in its state for either or both of two reasons, both leading to the same effect. Either the temperature of the substance is too great to remain at a liquid state, or there is insufficient pressure to keep the molecules together enough to remain a liquid. Both reasons will cause the molecules to spread out, eventually turning into a gas. For a gas to turn into a liquid, either the pressure the substance is under would have to be increased or the temperature decreased, causing the molecules to be pressed together enough to return to its liquid form.
Henry's law states that the solubility of a gas is directly proportional to the partial pressure of that gas over the liquid. The higher the partial pressure, the more gas will be dissolved-- that's why your blood boils in a vacuum; there's not enough pressure to keep the gas in it dissolved.
At the blade of a skate, the pressure applied on the ice forms a slight layer of liquid water that reduces friction, therefore allowing you to glide gracefully (or fall not so gracefully) across the ice. The water melts with increasing pressure is due to water strange property, the fact that it has a lower density as a solid than a liquid. Therefore, with applied pressure, the melting point of water decreases since the lower volume state is liquid. Therefore, under intense pressure you can actually keep liquid water below its normal melting point.
Gases such a xenon could be kept in a liquid state by keeping them at low temperature and at high pressure. Xenon belongs to a group of gases known as the noble or inert gases which are very chemically stable. At least some of these gases do not actually form liquids but move straight from gaseous to a "solid like state". This is the case for Helium which rather than form a liquid actually move to a solid powder like state.