The permeability of moulding sand was determined using a

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The permeability of moulding sand was determined using a standard AFS sample by passing 2000 cc of air at a gauge pressure of 10 g/cm². If the time taken for the air to escape was 1 min, the permeability number is

1. 112.4
2. 100.2
3. 75.3
4. 50.1

Correct Option: A

PN =	VH	=	2000 × 5.08
	pAT		10 ×	π	(5.08)² × 1
				4

PN = 50.12