Thermal Expansion

# Thermal Expansion - Thermal Expansion When the temperature...

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Thermal Expansion When the temperature of a material increases its length increases. This effect is called thermal expansion . The increase in length, [[Delta]]L, is proportional to the change in temperature [[Delta]]T: where [[alpha]] is a constant called the coefficient of linear expansion . The coefficient of linear expansion depends on the material and typical values range between 0.5 x 10 -6 K -1 and 10 x 10 -6 K -1 (at room temperature). For liquids the volume expansion is the only meaningful parameter where [[beta]] is the coefficient of volume expansion for the liquid. The coefficients of volume expansion and linear expansion are related. Suppose the temperature of a volume V (length L, height H and width W) is increased by [[Delta]]T. The volume change [[Delta]]V can be calculated We conclude that Water is the only exception of simple thermal expansion. Its specific volume passes through a minimum (maximum density) at 4 deg.C. Between 0 deg.C and 4 deg.C the water contracts with increasing temperature, and above 4 deg.C it expands with increasing temperature (that is why

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## This document was uploaded on 11/25/2011.

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Thermal Expansion - Thermal Expansion When the temperature...

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