Explain why most refractory materials have high porosity, Other Subject

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Explain why most refractory materials have high porosity

Questions:

1. Explain why most refractory materials such as firebricks and fiber board insulation have high volume fractions of porosity.

2. Pyrex and Vycor are both glasses that are used as crucibles. Why is the maximum useful temperature of Pyrex less than half that of Vycor?

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Other Subject: Explain why most refractory materials have high porosity

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