Water is used for cooling. You take in liquid water, release water vapor, and the phase transition takes away a lot of heat. Otherwise you need to pump that heat into dry air, which is much more difficult (energy-expensive). It's the same thing you do when you sweat.
Water is used for cooling. You take in liquid water, release water vapor, and the phase transition takes away a lot of heat. Otherwise you need to pump that heat into dry air, which is much more difficult (energy-expensive). It's the same thing you do when you sweat.