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Heat Transfer

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Skittles Bookworm

on 26 April 2010

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Transcript of Heat Transfer

What is temperature? How is it usually measured?
Heat Transfer By Jennifer Lee and Aisha Espinosa Describe how a thermometer works. Name three ways heat can be transferred. Briefly explain how the three heat the troposphere. Temperature is the average amount of energy of motion of the molecules of a substance. So, temperature is how hot or how cold it its. Temperature is usually measured by a thermometer, which is a thin glass tube with a bulb on one end that contains a liquid usually mercury or colored alcohol. A thermometer works because liquids expand when they are heated and contract when they are cold. When temperature increases, the liquid increases, expands, and rises up the column. Heat is transferred through radiation, conduction, and convection. Radiation is the direct transfer of energy by electromagnetic waves. Conduction is the transfer of heat through the direct contact of molecules in a substance or between substances. Convection is the transfer of heat through the movement of fluid. Convection, conduction, and radiation work together to heat the troposphere. Air near the the ground is warmer than air above because conduction only heats a few meters of the troposphere. Most of the heating of the troposphere is caused by convection.
since the molecules have more enrgy after being heated. The ir becomes less dense because of the movement of the molecules. The The hotter air rises, while the cooler air sinks. Convection currents move heat through this layer/ The End
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