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Which of the following is the most porous sand?(a) Silica sand(b) Zircon(c) Olivine(d) DolomiteI had been asked this question in an international level competition.The above asked question is from Refractory Sands topic in division Molding and Core Sands of Casting-Forming-Welding I

Answer»

Right answer is (a) Silica sand

For explanation I would SAY: Even when the silica sand are packed as MOULD cavity, they show enough POROSITY and permeability, and hence are POROUS sands.



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