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- Conduction is heat transfer through stationary matter by physical contact. ...
- Convection is the heat transfer by the macroscopic movement of a fluid. ...
- Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed.
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Heat can be transmitted by three different methods: conduction, convection, and radiation.
Conduction is usually a relatively slow process. The temperature difference between the substances and the amount and type of material involved affect the rate of heat transfer. Heat flows more quickly between substances with a greater difference in temperature. Touching a metal rod at 150° F (66° C) will heat a person’s hands much faster than touching a rod that is only 100° F (38° C). As a hotter object heats up a colder one, it generally becomes cooler itself. The temperature difference between the two decreases, and the rate of heat transfer slows down.
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