Thermal energy from a hot body flows to a cold body in the form of heat. This is called as transfer of heat. There are three ways by which the transfer of heat takes place. These are:

• conduction
• convection
• radiation

QUICK QUIZ

Think of objects around us getting heat or giving out heat.

Ans:    (i)     Melting of ice cubes. Ice cube gets heat from the surroundings.

           (ii)    A hot piece of iron radiates heat.

           (iii)   A black surface absorbs heat.

           (iv)   The glass of the greenhouse get heat from the sun.