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CH E 312 Lecture 7

# CH E 312 Lecture 7 - We learned 2.4.1 Manometers Manometer...

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2.4.1 Manometers Manometer rule: Step 1 : begin at one end of the manometer and write the pressure there. Step 2 : proceed to the other end, adding hydrostatic pressure when going up and subtracting hydrostatic pressure when going down, do not add/subtract anything when you are going horizontally or to the equal pressure point through a U-tube. Step 3 : at any point, the algebraic sum of the pressures can be equated to the pressure at that point. We learned... 1

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2.4.1 Manometers ρ 1 ρ 2 ρ 3 𝑃𝑃 𝐴𝐴 𝑃𝑃 𝐵𝐵 = ? Step 1 𝑃𝑃 𝐵𝐵 + 𝜌𝜌 3 𝑔𝑔ℎ 3 + 𝜌𝜌 2 𝑔𝑔ℎ 2 Step 2 (+↓, - ↑) Step 3 −𝜌𝜌 1 𝑔𝑔ℎ 1 = 𝑃𝑃 𝐴𝐴 𝑃𝑃 𝐴𝐴 𝑃𝑃 𝐵𝐵 = 𝜌𝜌 3 𝑔𝑔ℎ 3 + 𝜌𝜌 2 𝑔𝑔ℎ 2 - 𝜌𝜌 1 𝑔𝑔ℎ 1 We learned... 2
2.4.3 Inclined Manometers 2.4 Pressure Measurement To measure small pressure changes (usually for gas), a manometer with an inclined tube is frequently used. One leg of the manometer is inclined at an angle θ , and the differential reading l 2 is measured along the inclined tube.

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