In my experience, doing 3-6 reps is the sweet spot for this type of training. As this is done in a circuit fashion with incomplete rest, you'll be unable to perform the same loads as during traditional lifting sessions.
The water on your body changes to a gas called water vapor. Water turns into a gas through a process called evaporation. Heat makes water evaporate faster. All air has some water vapor. Tropical rain forests and deserts are both hot.
For example, on a hot summer's day if you sprinkle water on your skin it will cool your skin as you evaporate. That's an example of refrigeration! Water can't be used in freezer though, because it evaporates at too high a temperature. But some liquids evaporate at very low temperatures. For example Isobutane (becoming more common in domestic freezers) evaporates at very low temperatures.