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Question 140

A manometer containing a liquid of density ρ \rho\,ρ is used to measure the difference between the pressure of a gas, PgasP_{\text{gas}}Pgas​, and atmospheric pressure, PatmP_{\text{atm}}Patm​.

In this setup:

  • The left arm of the manometer is connected to the gas supply, and the liquid level (meniscus) in this arm is lower.
  • The right arm is open to the atmosphere, and the liquid level there is higher.
  • d1 d_1\,d1​ is the vertical distance from the top gas inlet pipe to the lower liquid level in the left arm.
  • d2 d_2\,d2​ is the vertical distance from the lower liquid level in the left arm to the baseline at the bottom of the U-bend.
  • d3 d_3\,d3​ is the vertical distance between the lower liquid level in the left arm and the higher liquid level in the right arm.
  • d4 d_4\,d4​ is the vertical distance from the higher liquid level in the right arm to the baseline at the bottom of the U-bend.

If g g\,g is the acceleration of free fall, which expression represents the pressure difference Pgas−PatmP_{\text{gas}} - P_{\text{atm}}Pgas​−Patm​?

A

ρgd1\rho g d_1ρgd1​

B

ρgd2\rho g d_2ρgd2​

C

ρgd3\rho g d_3ρgd3​

D

ρgd4\rho g d_4ρgd4​

Markscheme

Pressure Questions

  1. IGCSE
  2. /Physics
  3. /Pressure

188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.

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