Question

what is principal of heat exchange ?​

Answer 1

When hot body is kept in contact with cold body , then the quantity of heat lost by hot body is equal to the quantity of heat gained by cold body is called principal of heat exchange.

The three types of heat transfer

Convection.

Conduction.

Radiation.

Answer 2

${{ \fcolorbox{pink}{pink}{principle \: of \: heat \: exchange}}}$

heat energy lost by the hot object = heat energy gained by the cold object .