Question

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Examine Figure 1. Assume the manometer is filled with water, that hi = 38.6 cm and h2 = 76.5 cm. If the atmospheric pressure is 742 mm Hg, what is the pressure of the enclosed gas in mm Hg?

Answer 1

Answer- 769.86 mm

OR

Answer 769.9 mm

an NV Phi - Patm - 742 mm Hg gas - Pressure at point a since the liquid is not moving en horizontal direction - Pressure at same vertical height is equal le PE-PB PA = P₂ = P + Pwater g (h2h) P 742 mnt Pwater= 1000kg/m3 & h₂h = 76.5-38-6) am = 37.9 cm hath = 0.379 m. Pwater guzhi) = 1000 kg/m3 x 98 x 0.379m = 3714.2 Pa 52 n = 760 mm I Pascal = To 13as atm = 701325 3714.2 Pascal - 760 & 3714.2 mm 101325 water hekilg = 27.86 mer = 742 + 27.86 mm Po - PA = 769.86 mm - 769 86 wm