When a glass rod is placed in steam, its length increases but its width :

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. Why?

A glass bottle containing water tightly corked breaks when it is kept in freezer, because -

Rate of evaporation increases with

Evaporation from the surface of a given liquid takes place more rapidly when

The amount of heat required to change from liquid state to gaseous state without rise in its temperature is called: