Convert a reading of 18 inches Hg vacuum to psia
A) 18 in Hg + 30 = 48 psia (rounded)
B) 30 - 18 in Hg vacuum = 12 in Hg absolute (rounded)
12 in Hg absolute / 2 = 6 psia (rounded)
C) 30 + 18 in Hg vacuum = 48 in Hg absolute (rounded)
48 in Hg absolute / 2 = 24 psia (rounded)
D) 18 in Hg / 2 = 9 psia (rounded)
B
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