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Class15 - A Closer Look at Thermal Expansion Review the...

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2/10/12 Oregon State University PH 202, Lecture 15 1 A Closer Look at Thermal Expansion Review the basics : At room temperature, a clock keeps accurate time via a simple pendulum whose arm is just a long, thin metal wire. When the temperature drops…. The clock runs fast. The clock runs slow. The clock still keeps accurate time.
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2/10/12 Oregon State University PH 202, Lecture 15 2 Of course, fluids expand only in the volumetric sense; they don’t maintain rigid dimensions in the sense of length, width or height. In a solid material, though, each of its dimensions (length, width, height) expands according to the α coefficient of the material: L = L i α∆ T Moreover, a geometric analysis shows that any gap in a solid mater- ial expands just as if it were made of that material. So when two different solid materials undergo the same temperature change, they expand by different proportions; they don’t “fit together” anymore.
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