Convert a reading of 18 in Hg vacuum to psia

A) 30 + 18 in Hg vacuum = 48 in Hg absolute (rounded)48 in Hg absolute/2 = 24 psia (rounded)
B) 18 in Hg/2 = 9 psia (rounded)
C) 30 — 18 in Hg vacuum = 12 in Hg absolute (rounded)12 in Hg absolute/2 = 6 psia (rounded)
D) 18 in Hg + 30 = 48 psia (rounded)


C

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Given: v = 0.003155 m3/kg

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