Manometer Pressure Difference
Manometer Pressure Difference
A liquid-column manometer reads a pressure difference directly from the height it supports — a simple, absolute measurement.
The pressure difference is Δp = ρ·g·h. where ρ is the manometer fluid density, g gravity and h the column height.
Inputs
rho := 13600 kg/m^3=13600 kg/m^3
g := 9.81 m/s^2=9.81 m/s^2
h := 0.05 m=50 mm
Convert the liquid height to a pressure.
dP := rho·g·h=6670.8 Pa
Results
A denser fluid (mercury) reads a smaller height for the same pressure, keeping the instrument compact. Water gives a taller, more sensitive column.
Assumptions & limitations
- Static columns.
- Single manometer fluid.
- Uniform fluid density.