1. For the picture below, if the pressure within the water tank on the left at p

Question

1. For the picture below, if the pressure within the water tank on the left at point A is 20 kPa (gauge), what is the gauge pressure of the air in the tank on the right? The density of SAE 10W-30 oil at 20 °C is 865 kg/m3. The density of water at 20 °C is 998 kg/m3. (18.3)

ENGI 2102: Assignment 2 - Manometers 1. For the picture below, if the pressure within the water tank on the left at point A is 20 kPa (gauge), what is the gauge pressure of the air in the tank on the right? The density of SAE 10W-30 oil at 20 °C is 865 kg/m3. The density of water at 20 °C is 998 kg/m3. (18.3) Air SAE 10W-30 Oil Liquid, SG 1.38 60 mm Water 30 mm 50 mm 75 mm 115 mm 35 mm

Explanation / Answer

Here,

PA = 20 kPa

Now for the pressure in the right tank

Using Pascal's law

pressure in the bottom horizontal pipe = pressure at the bottom horizontal pipe

PA - 998 * g * 0.050 + 998 * g * 0.035 + 865 * g * 0.075 = P + (0.060 + 0.115) * g* 1.38 * 998

20 *10^3 - 998 * 0.050 * 9.8+ 998 * 0.035 * 9.8 + 865 * 0.075 * 9.8 = P + (0.060 + 0.115) * 1.38 * 998 * 9.8

solving for P

P = 18127.1 Pa

the pressure in the right container is 18127.1 Pa

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