What are the ways which heat can be transferred?

Answer 1

There is a special mechanism that controls heat transfer.

Answer 2

The three basic mechanisms of heat transfer are conduction, convection and radiation. Let's look at each briefly.

In conduction, like through a copper rod, the thermal energy (heat) is passed from atom to atom to atom along the length of the copper rod.

In convection, a movement of atoms or molecules conveys heat by picking it up and moving it away. If you wet your finger and blow on it, the evaporation of the moisture by the moving air (convection) will carry away thermal energy.

In radiation, thermal energy is carried away by electromagnetic energy, like infrared radiation. If an oven or a burner on a stove is on (particularly if it is on high), you can generally feel the heat on your face if you just walk into the kitchen and look at the stove from a few feet away. A blazing fire will produce the same effect, and this is due to radiation.

Answer 3

Thermal energy (heat) is transferred in four ways. These mechanisms are conduction, convection, radiationand mass transfer.

In conduction, when the thermal energy of a given part of something is higher than another part, heat will be transferred from atom to atom or from molecule to molecule. The heat is said to be conducted along or through the material. An example is a copper rod. If one end is heated, thermal energy moves along the rod in a "daisy chain" from atom to atom because those atoms are "against" each other.

In convection, the thermal energy moves because it is "carried" by something like a fluid. If we look at a hot stove in a kitchen, that appliance will heat air that is against its surfaces. The hot air will rise away from the unit, and cooler air will take its place and become heated in turn. This continues with the air carrying off the heat and warming the whole kitchen.

In radiation, electromagnetic waves, such as infrared light, carry heat energy away from a source. An individual who has had a sunburn on his face might look at a red hot electric range element and feel his face burning. The sunburn will have made his skin extremely sensitive to heat, particularly since it has been damaged by heat. And the infrared electromagnetic waves from the burner are reaching the individual's face and it burns. Just holding a hand palm out toward a heat source (but not above it to avoid convection) can have a dramatic result. The heat can be felt, and there is no conduction or convection taking place immediately to get the thermal energy from the source to the hand of the observer. That heat must be arriving via an "energy transfer" of some kind.

Mass transfer: Movement of physical objects is a movement of their internal energy.

Answer 4

Good conductors of heat contain delocalised electrons which when heated gain energy and pass their energy by colliding with the lattice of particles.

Poor conductors of heat transfer heat by passing vibrations to neighbouring particles.

Answer 5

Heat can be transferred in three ways: - Convection - Conduction - Radiation

Answer 6

Heat can be transferred in three ways. Convection, conduction and radiation

Answer 7

The three main ways are conduction, convection and radiation.

Answer 8

Conduction, convection, radiation.