Heat Transfer Mechanisms

Heat Transfer Mechanisms
Physics 212 Josh Kunz

Radiation

Radiation is the third type of heat transfer and life on this earth would not exist without it. One of the largest sources of radiation on earth is the sun. Heat from the sun is a result of electromagnetic waves traveling through space and carrying energy to the earth.

(http://www.proprofs.com/quiz-school/story.php?title=heat-transfer-convection-conduction-radiation)

Radiation can occur through solids or in a vacuum and is emitted by all objects made up of matter. Radiation itself is made up of electromagnetic waves that are generated by oscillating electric charges in the atoms that form the objects. These electromagnetic waves carry energy from one object to another (Knight 2008).

The relationship of net radiation from hot objects is called the Stefan-Boltzmann law. This law states that the total radiant heat energy emitted from a surface is proportional to the forth power of its absolute temperature (Knight 2008).

(http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html#c2)

Essentially this means that the hotter the object, the more it radiates.

This site was designed in compliance to the UAF Physics 212 Section 007 website project. 04/19/2015 Josh Kunz

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