Who knows which two physical problems. . . . Acute

1, swimming, people have such a feeling: From out of the water to the shore than in the water cooler, this is why?

2, in the hot summer, as long as sweat is not easy to heat stroke, which is why?

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1, because the sub-evaporating away the body heat, so they feel the cold

2, because the evaporation of sweat to take away the body heat, reducing temperature to prevent heat stroke

evaporation endothermic