The heat flow through solids only by

The fundamental modes of heat transfer are:

• Conduction is the method of transfer of heat within a body or from one body to the other due to the transfer of heat by molecules vibrating at their mean positions. The bodies through which the heat transfers must be in contact with each other. Conduction occurs usually in solids where molecules in the structure are held together strongly by intermolecular forces of attraction amongst them and so they only vibrate about their mean positions as they receive heat energy and thus pass it to the surrounding molecules through the vibration.
• Convection is the mode of heat transfer which occurs mostly in liquids and gases. In this method, heat transfer takes place through the actual motion of matter from one place within the body to the other.
• Radiation is a form of heat transfer. It does not require any medium and can be used for transfer of heat in a vacuum as well. This method uses electromagnetic waves which transfer heat from one place to the other.