The manometer shown in the fig. contains oil of relative density or specific gravity $s = 0.85$ . Determine the absolute pressure in the bulb if the atmospheric pressure is 100 kPa. ( $g = 10 m/ s^{2}$ )

Question

The manometer shown in the fig. contains oil of relative density or specific gravity s = 0.85 . Determine the absolute pressure in the bulb if the atmospheric pressure is 100 kPa. ( g = 10 m/ s 2 )

TestHub · Accepted Answer

From point A, equate pressure at the oil surface to atmospheric pressure:
$P_{A} - ρ_{oil} g h = P_{atm}$
$ρ_{oil} = 0.85 (1 0^{3}) kg/ m^{3}$
$h = 0.4 m, g = 10 m/ s^{2}$
$P_{A} = 100 kPa + 3.4 kPa$
$P_{A} = 103.4 kPa$
The gas pressure variation is negligible compared with the oil pressure change. Option C.

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