Pressure Measurement

Manometer

  • A manometer is the simplest device to measure pressure differences. A common simple manometer consists of a U shaped tube of glass filled with some liquid.

  • Manometric fluids can be colored water, air, oil, carbon tetra chloride, benzenes, bromides, and mercury.

  • Manometer principle: pressure at the same level in a continuous body of fluid are equal.

Making pressure balance at \(XX'\), \[\begin{aligned} P_X &= P_X' \\ P_1 + \rho g a + \rho g h &= P_2+\rho g a + \rho_m g h \\ P_1 - P_2 &= (\rho_m - \rho) g h \end{aligned}\]

Other Types of Manometers:




Inverted U-tube Manometer