when the body is hot , sweat is produced to cool the body & if heat is absorbed from a source then that heat source will cool ->  heat is absorbed from the body by sweat  heat is absorbed from the body by sweat & if heat is added to a substance then that substance absorbs that heat ->  heat is added to sweat as it absorbs heat from the body  sweat is a kind of liquid & evaporation means a substance changes from a liquid into a gas by increasing heat energy ->  sweat will evaporate if its heat energy is increased  heat is added to sweat as it absorbs heat from the body & sweat will evaporate if its heat energy is increased ->  sweat evaporates as it absorbs heat from the body  sweat evaporates as it absorbs heat from the body & if heat is absorbed from a source then that heat source will cool -> a body is cooled by sweat absorbing heat as it evaporates