The critical point of liquid water is at 650°K (with a much higher pressure than you care to create in space: 22MPa), which is only 450° above the sublimation temperature. But the water should be cooled by 540° to provide enough heat to evaporate completely.Click to see full answer. Similarly, you may ask, does water evaporate in a vacuum?In a vacuum, water evaporates like in dry air (this is why sweating cools you in dry hot weather). In humid air (100% humidity), there is an equilibrium between vapor and liquid. The equilibrium means that the same amount of molecules condensate per second as other ones evaporate, so that the net change is zero.Secondly, what temperature will water boil in a vacuum? 100 degree Celsius Additionally, what temperature does water evaporate at? 212° FHow does water boil in a vacuum?A vacuum pump is used to reduce the ambient pressure above water under a sealed bell jar. By reducing the pressure, the boiling point is lowered so that the water begins to boil at room temperature. When the ambient pressure is reduced to below the vapor pressure of the liquid, the liquid boils.
