At room temperature, water isn’t boiling. Then why does it evaporate?

All fluids are always evaporating. High temperatures just increase the rate of evaporation. What is Evaporation ? A fluid has billions of molecules, all whizzing around at different speeds. Most molecules have a ‘most probable velocity’ (which is low for water at room temperature). Some have low velocities while some have very high velocities. If …

How will you cool something ?

No, not by keeping it in a fridge. Think about how can we cool something below room temperature? Almost all cooling appliances (AC, refrigerator) work on the same simple principle - evaporation. Put some nail polish remover or alcohol or ammonia on your hand. As we watch it evaporate, our hand feels cold. Because volatile …