Why does all the water of the earth not get evaporated during hot summer days?

How does applying pressure (or compression) help in the liquefaction of a gas?

How does perspiration or sweating help keep our body cool on a hot day?

If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool?

Why does a desert cooler cool better on a hot, dry day?