The following different diagram provides a schematic of the volume vs. temperatu

Question

The following different diagram provides a schematic of the volume vs. temperature for several different types of material. The following aspects these materials are labeled as 0, 1, 2, 3, or 4 as appropriate. Choose the correct answer for each on the score sheet. a. melting point for a crystalline material. b. glass transition temperature for a semi-crystalline material. c. glass line (coefficient of thermal expansion for a glassy material) d. supercooled liquid line. e. crystal line (coefficient of thermal expansion for 100% crystalline material)

Explanation / Answer

5)

a. When a crystalline material is heated, the melting temperature is well defined. The Point which labeled as Zero[0] in the specific volume vs. temperature graph is the melting point of the crystal.

b.But on cooling, it is often possible to undercool the liquid so that nucleation and growth do not occur. At a temperature below melting point temperature, the material can become rigid and act like a solid, while preserving the amorphous atom arrangement. This is called the glass transition temperature. This glass transition temperature is labelled as Two[2] in the  specific volume vs. temperature graph.

c.Glass can be classified as a super-cooled liquid in which crystallization has not occurred. There are quite many similarities between glass and liquids. Glass line in the graph is labelled as four[4]. which is below glass transition temperature.

d. The increasingly high viscosity of mixtures at lowering temperatures — and the absence of nucleation — means that the mixtures can be supercooled below the freezing/melting temperature without freezing. In the graph supercooled liquid line is labelled as three[3].

e. crystal line(coefficient of thermal expansion of 100% crystalline material) is labelled as one[1] in the specific volume vs. temperature graph.

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