The principle of vapour compression system is that fluids absorb heat while changing from a

A

Vapour phase to liquid phase and give up heat in changing from liquid phase to vapour phase

B

Liquid phase to vapour phase and give up heat in changing from a vapour phase to liquid phase

C

Vapour phaseto liquid phase only

D

Liquid phase to solid state phase and give up heat in changing from solid state to liquid phase