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Heat transfer - Wikipedia, the free encyclopedia
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Heat equation - Wikipedia, the free encyclopedia
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op Energy and heat flow; heat flow in nature; radiation and conduction. Science and technology education from FT Exploring ... Energy, in the process we call heat or heat flow, is constantly flowing into and out of all objects, including living objects. Heat flow moves energy from a higher temperature to a lower...
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Conduction is the flow of heat energy from regions of warmer temperature to regions of cooler temperature. As we can see from the following equation for the heat current, or rate of heat flow:
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Let's get back to the total heat for a moment. Although 38 trillion Watts is a lot of energy, when we spread it out over the entire surface of the Earth, the average global heat flow is only about 0.075 Watts/meter2.
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In the simplest of terms, the discipline of heat transfer is concerned with only two things: temperature, and the flow of heat. Temperature represents the amount of thermal energy available, whereas heat flow represents the movement of thermal energy from place to place.
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It is important to emphasize that this statement of the 2nd law applies to the spontaneous flow of heat from hot to cold. It is possible, of course, to make a cool object in a warm place cooler - this is what a refrigerator does - but this involves the input of some external energy.
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The physicists also say these changes in ocean heat-flow direction should be taken into account when predicting global climate because the oceans represent 90 percent of the total heat in the earth’s climate system.
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Researchers examine heat transport through a single molecule. ... Heat conduction is considered to be one of the "solved problems" of physics, until you examine the problem closely. Currently, our explanation of heat conduction is based around something called phonons, which are sound vibrations.
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