A large DECREASE in the surface pressure will result in water turning to water vapor at room temperature.
Liquid at room temp. Solid at freezing. Vapor at Boiling.
Evaporation.
the temp changes
Water vapor can form at any temperature above 0°C (32°F), but higher temperatures generally lead to more rapid evaporation and increased levels of water vapor in the air.
195-210
The ratio of air's water vapor content to its capacity to hold water vapor at the same temperature is known as the relative humidity. It is expressed as a percentage and indicates how close the air is to being fully saturated with water vapor at that temperature. A relative humidity of 100% means the air is holding the maximum amount of water vapor it can at that temperature.
When the surface of an object becomes colder as a result of sending its latent heat out, the existing moisture in the atmosphere contracts among itself. the air capacity for holding water depends on temp'. the warmer it is the more water vapor it can hold. during the night air temp' drops to its lowest near dawn at which point the amount of water vapor in the air may exceed its reduced capacity (this point is called the dew point) and water vapor condenses and forms dew.
The relative humidity will decrease.
Water saturation temperature is the maximum temperature at which water can exist in a stable liquid state at a given pressure. It is the temperature at which water vapor in equilibrium with liquid water exerts a partial pressure equal to the vapor pressure of pure water at that temperature.
Normal temp for a 71 El Camino 350 is in the 185 to 195 degree range. The thermostat can be changed to a different temp to make the engine run a little hotter or cooler.
the point at which a liquid turns into a gas depends on the atmospheric pressure and the liquid water turns to gas at 100 degrees C at 1atm of pressure
It's call condensation.