When measuring small pressure differences with a manometer, often one arm of the manometer is inclined to improve the accuracy of reading. (The pressure difference is still proportional to the vertical distance and not the actual length of the fluid along the tube.) The air pressure in a circular duct is to be measured using a manometer whose open arm is inclined 45° from the horizontal, as shown in Fig. 1–112. The density of the liquid in the manometer is 0.81 kg/L, and the vertical distance between the fluid levels in the two arms of the manometer is 12 cm. Determine the gage pressure of air in the duct and the length of the fluid column in the inclined arm above the fluid level in the vertical arm.
When measuring small pressure differences with a manometer, often one arm of the manometer is inclined to improve the accuracy of reading. (The pressure difference is still proportional to the vertical distance and not the actual length of the fluid along the tube.) The air pressure in a circular duct is to be measured using a manometer whose open arm is inclined 45° from the horizontal, as shown in Fig. 1–112. The density of the liquid in the manometer is 0.81 kg/L, and the vertical distance between the fluid levels in the two arms of the manometer is 12 cm. Determine the gage pressure of air in the duct and the length of the fluid column in the inclined arm above the fluid level in the vertical arm.
Solution Summary: The author shows the free body diagram of the inclined manometer. Write the expression of gage pressure in duct.
When measuring small pressure differences with a manometer, often one arm of the manometer is inclined to improve the accuracy of reading. (The pressure difference is still proportional to the vertical distance and not the actual length of the fluid along the tube.) The air pressure in a circular duct is to be measured using a manometer whose open arm is inclined 45° from the horizontal, as shown in Fig. 1–112. The density of the liquid in the manometer is 0.81 kg/L, and the vertical distance between the fluid levels in the two arms of the manometer is 12 cm. Determine the gage pressure of air in the duct and the length of the fluid column in the inclined arm above the fluid level in the vertical arm.
Q マつ
13,600 kg/m) is con-
1-67 A mercury manometer (p
nected 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. P1-67, determine if the pressure in the duct is above or
below the atmospheric pressure. (b) Determine the absolute
pressure in the duct.
Air
h = 15 mm
P = ?
FIGURE P1-67
hp
A vacuum gauge connected to a steam condenser shows that the pressure inside the condenser is 0.751 bar below the atmospheric pressure. If the atmospheric pressure is 1.086 bar, what is the absolute pressure of the steam inside the condenser in kPa? answer in 3 decimal places.
The pressure gauge reading at the suction and discharge sides of a pump are 10 psig vacuum and 10 kgf/cm2 respectively. Atmospheric pressure is 750 mm Hg. Determine the absolute pressures on both sides of the pump expressed in kPa.
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