Heat is transmitted in three ways. They are

• Conduction

• Convection

• Radiation

Conduction: Conduction is the process of heat transfer that happens in solid. The gases and liquid are poor conductors of heat. 

Convection: Convection is the process of heat transfer that happens in liquid and gas. 

Radiation: Radiation is the process of the transmission of heat energy from the sun. This type of transmission of heat energy does not require any medium.