an object that absorbs all radiation falling on it, at all wavelengths, is called a black body.
When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature.
Its emission is called black-body radiation.
The heat is transferred by conduction, convection and radiation in
The amount of heat flow through a body by conduction is
- Directly proportional to the surface area of the body
- Directly proportional to the temperature difference on the two faces of the body
- Dependent upon the material of the body