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3 means of heat transfer

Heat may be transferred from one substance to another by three means - Conduction, Convection, and Radiation.  

Anytime two items, whatever they may be are placed near each other they begin to equalize in temperatures. The bigger the temperature difference, the faster the heat transfer occurs.

Heat transfer always occurs from a hot object to a cold object.

Convection is the transfer of heat by the actual movement of the warmed matter.

Heat leaves a fire as the currents of steam and air rise, this can be increased by the use of a fan.

Convection is the transfer of heat energy in a gas or liquid by movement of currents in air and also water.

Conduction is the transfer of energy through matter from particle to particle.

It is the transfer and distribution of heat energy from atom to atom within a substance. 

An example of this would be the transfer of heat along a metal rod, when only the end is being heated by a bunsen burner. 

Radiation:  Sunlight is a form of radiation that is radiated through space to our planet without the aid of fluids or solids. The energy travels through nothingness!

Just think of it! The sun transfers heat through 93 million miles of space.  Since there are no fluids (like air and water) in space, radiation brings heat to our planet.