The 3 different processes for transfer of thermal energy:

1)Conduction
2)Convection
3)Radiation



Qns:

During winter, it is common for people to say "keep the cold out of the house". Is this statement correct? Comment.


Ans:

Transfer of thermal energy cannot be stopped but an equilibrium temperature can be achieved between the house and the surrounding outside. Thus, it is impossible to "keep the cold out of the house". However, it is possible to reduce the transfer of thermal energy.

Normally, the house will be the warmer region while the surrounding will be the colder one. So, according to the theory of thermal transfer, heat will actually flow from the house to the surrounding, and then until they both reached an equilibrium temperature.

What the people said about "keeping the cold out of the house" may actually mean to close the doors to prevent the loss of heat quickly.