Discussion
A refractory brick of bulk density 2.1 g/cm\( ^3 \) and true density 2.8 g/cm\( ^3 \) has a porosity of
Answer: B
Correct answer: 25 per cent
Porosity is the fraction of the volume that is void, given by comparing bulk and true density: \[ P = 1 - \frac{\rho_{bulk}}{\rho_{true}} = 1 - \frac{2.1}{2.8} = 1 - 0.75 = 0.25. \] Porosity matters because it governs how readily slag penetrates the brick and how well it insulates - and those two pull in opposite directions.
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