A liquid-filled tube called a manometer can be used to measure the pleasure insi

Question

A liquid-filled tube called a manometer can be used to measure the pleasure inside a container by comparing it to the atmospheric pressure and measuring the height of the liquid Such a device (filled with mercury) is shown in the figure, measuring the pressure inside a jar of peanuts The mercury level on the side of the manometer which is open to the air is 6.2 cm lower than on the side connected to the balloon. Find the gauge pressure in the jar. in units of Pa. Assume the density of mercury is 13.5 g/cm^3. P_g = 8202.6 Find the absolute pressure in the jar in units of Pa.

Explanation / Answer

(A) P_gauge = rho g (-h)

= (13.5 x 10^3 kg / m^3) (9.8) (-6.2 x 10^-2)

= - 8202.6 Pa

(B) Pabsoluet = Patm + P_gauge

= 101325 - 8202.6

= 93122.4 Pa

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