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.
As the water molecules about 7 to 8 natural clumping together is broken apart, the water molecules exist in gas form and free into the atmosphere from the water. If the water is just merely heated but not reaching boiling point, what happened to the water is evaporation.