Conduction and convection

Answer 1

A: CONVENTIONAL heating means heated air and eventually it heat up a room. conduction is the art of taking the heat away by material that is has very good temperature coefficient like copper. there is a third source of heat and that is radiation a lamp is not a heater but if you allow the ray to heat you you will become hot but only where the radiation is applied and nothing else

Answer 2

Conduction and convection are two of the methods of heat transfer.

Conduction, also known as diffusion is the movement of heat between objects in physical contact with each other. A soldering iron is a great example of transferring heat to the solder and the items being soldered by mutual physical contact.

Convection is the transfer of heat via the movement of a fluid. When most fluids (liquids or gases) are heated their density decreases causing them to move relative to cooler, denser parts of the same body of fluid creating a convection current. All planetary winds are caused by convection as the Earth's rotation causes heating and expansion in some parts of the globe as the air cools in others.

The other methods of heat transfer are:

Radiation: a transfer of energy to or from an object via electromagnetic radiation. it's mostly what you can feel in the first the instant you turn on an electric heater, before it starts to heat the surrounding air.

Advection: moving energy from one place to another by moving a hot object. For instance used for underground hog roasts etc. where rocks are heated in a fire above ground then buried with the item to be cooked.