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What is the boiling point of water in space? Replies: The boiling point of water is fixed by its temperature, and the vapor pressure of water at that temperature. So for example, if the water is at 100 C. the boiling point is 100 C. at a pressure of 1 atm (which is equal to 760 mm of Hg).
So, the speed of evporation could be practically anything depending on these conditions. As an example, let's take a cup of tap water in a kitchen at room temperature (21C). So, the water from the tap will be at around 5C, at this air temperature of 21C the vapour pressure of water is 0.02486Bar = 2.486kPa. Typical room conditions are around 60% humidity, so 0.6x0.02486 is the pressure of the water vapour in the air which will be 1.4916kPa. (Remember humidity = Ps/Pg for given temperature, in this case 21C. There is no wind in the kitchen, so V=0m/s, and Y for water is given as 2272kJ/kg.