Porosity of silica bricks varies from ______________ percent?
Correct answer: B. 20 to 30
- A. 5 to 10
- B. 20 to 30
- C. 45 to 60
- D. 60 to 75
Explanation
Silica bricks commonly have about 20 to 30% apparent porosity, which provides a balance between thermal resistance and mechanical strength. The much higher ranges would make the bricks excessively weak and permeable.
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