Question

A mercury manometer (p = 13600 kg/m³) is connected to an air duct to measure the pressure inside. The difference in the manometer levels is 15 mm, and the atmospheric pressure is 100 kPa. (a) Judging from Fig. P2-46, determine if the pressure in the duct is above or below the atmospheric pressure. (b) Determine the absolute pressure in the duct.

Answer 1

Explanation:

p = 104kPA

◌please refer to the attached file for the process◌

Answer 2

Answer:

102kPa

Explanation:

formula : P = Patm + p g

reduce SI unit

15mm (1m/1000mm) = 15 x 10^-3m

100kPa = 100 x 10^3 Pa

lets calculate absolute pressure,

P = 100 x 10^3 + (13.6 x 9.8 x 15)

P = 101999.2 Pa

P = 102 kPa.