GCSE Physics - Using Liquid in a U-Tube to Measure Pressure Difference

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This tutorial explains how we can measure the pressure difference using the height difference of a liquid in a u-tube (called a manometer).

So a simple measure of the pressure difference between the two ends of the manometer is measured in cm of water (or sometimes mm of mercury).

The pressure difference between the two ends measured in pascals is: p = ρ.g.(Δh)

So if you had one end open to atmospheric pressure and one end connected to a gas supply, then we could say that:
gas pressure = atmospheric pressure + ρ.g.(Δh)

Check out more GCSE physics tutorials at http://gcsephysicsninja.com

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