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Heat Transfer

A series of free High School Physics Video Lessons from Brightstorm online Physics series..

Radiant Energy
Radiant Energy is a type of thermal energy transfer involving electromagnetic waves. In the case of visible light, radiant energy is visible to the human eye, but in all other cases, it is not.

Law of Cooling
Newton's law of cooling states that a hot object will transfer its heat to a cooler object faster depending on how cold that object is. Stated mathematically, it says that the rate of change of the hot object is proportional to the temperature difference between it and its surroundings.

Greenhouse Effect
In the greenhouse effect, the gases of which our atmosphere is composed absorbs the thermal energy that the Earth radiates and reflects some of it downwards again, towards the Earth, effectively trapping heat inside the atmosphere. As light arrives from the sun, more and more thermal energy is trapped, increasing the temperature of the planet.

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