Evaporation of water from our skin is a very important mechanism for controlling body temperature.
(a) This is because (1) water has a high specific heat, (2) water has a high latent heat of vaporization, (3) water contains more heat when hot, (4) water is a good heat conductor.
(b) In a 3.5-h intense cycling race, a cyclist can loses 7.0 kg of water through perspiration. Estimate how much heat the cyclist loses in the process.