Heat Transfer

Conduction, Convection, Radiation

Conduction

Heat can be transferred by conduction . When an object is heated, the particles in the object start to vibrate. These vibrations are passed on through the objects, transferring the heat from one end to the other.


Example:

An example of conduction is when you iron. A shirt is placed on an ironing board to be ironed. Heat from the iron is conducted to the shirt, making it easy to iron out all those unsightly wrinkles and make the shirt look sharp.

Convection

Heat can be transferred from one place to another via connection. In convection hotter particles rise and cooler particles fall circulating heat.


Example:

An example of convection is a heater. Hot air rises when the heater is turned on and pushes the cold air down so that the heater can heat the particles in the cold air, and when the hot air becomes cold again it falls back down to the heater in a pattern until you turn off the heater.

Radiation

Radiation is a transfer of heat from one place to another using invisible waves. All objects give out heat via radiation but hot objects radiate more heat than cool objects. Dark objects radiate more heat than light objects.


Example:

An example of radiation is when the sun heats up the earths. The suns heat energy radiates little waves of heat that warms up the earth.

Conduction, Convection and radiation in an example

A good example would be heating a tin can of water using a Bunsen burner. Initially the flame produces radiation which heats the tin can. The tin can then transfers heat to the water through conduction. The hot water then rises to the top, in the convection process.
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