8.7 - g the material will reach a point where it becomes so...

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The term supercooled liquid is often used synonymously with glass. Strictly speaking, however, the term supercooled liquid 1 is the material between T g m and the term glass is the material below T g , where it has become a truly rigid solid, (although still noncrystalline,) deforming by an elastic mechanism. Below T g it is in a rigid, brittle glassy state. Note: the slope of this curve is related to the thermal expansion coefficient. The thermal expansion coefficient above T g is comparable to that of a liquid. Below T g it is comparable to a solid. At a temperature above T
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Unformatted text preview: g the material will reach a point where it becomes so fluid that it cant support the weight of a probe. This is the softening temperature . 1 The term supercooled liquid is confusing. In the context of glasses, supercooled liquid refers to the material between T g and T m and it is an equilibrium product. However, another way the term is used is to refer to a material that is cooled so fast that it remains a liquid below its melting point. In this case, the material is a non-equilibrium product. That is not what we are referring to here....
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This note was uploaded on 08/10/2009 for the course ENGN 45 taught by Professor Wendy during the Spring '09 term at City College of San Francisco.

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