Why a heavy weight is easy to lift in water?

Why a heavy weight is easy to lift in water?

In water, an upward force or buoyancy acts on any heavy object. For this reason a heavy object appears lighter when immersed in water and it becomes easy to lift it.

Air is at rest will absorb same heat from our body. But being wet makes this worse. Both because air agitates the water and brings cold water back in contact with our skin and because it increases the rate of evaporation. 

Evaporation takes energy from the surroundings i.e. our skin. When it occurs and makes us colder.