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With an increase in air pressure measurement of the specimen, what change is seen in the permeability number?

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in Casting-Forming-Welding II by (119k points)
With an increase in air pressure measurement of the specimen, what change is seen in the permeability number?

(a) Increases

(b) Decreases

(c) No change occurs

(d) No relation between the two

I had been asked this question by my college professor while I was bunking the class.

The query is from Testing of Core Sands in section Sand Reclamation & Control Test of Casting-Forming-Welding II

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Right answer is (b) Decreases

For explanation: With an increase in the air pressure measurement of the specimen, there is a decrease in the permeability number, since the two have an inverse relation.

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