540 calories per ml or g of water required to evaporate only 1 ml of water.
About 540 calories per ml or g of water are needed to convert one gram of water that is present in liquid state into vapor form under normal pressure. The evaporation of water at removing excess heat from our body is very effective in lowering the temperature of our body and in maintaining homeostasis.
Our body removes heat with the help of water that is move from the small openings present on our skin in the form of sweats so we can say that evaporation of water at removing excess heat from our body is very effective.
Because they both have the same push of gravity. Gravity affects all objects equally. If you drop an egg and a watermelon at the same time they would both collide with the floor at the same time.