# The Differential Manometer

**The Differential Manometer Equation**

Cancel and then group terms to get:

A differential manometer measures the pressure difference between two points, in this case P1 - P5.

Given h, ρm and ρw, determine P1 - P5.

What do we know ?

Apply the Barometer Equation to determine P2 relative to P1 and P3 relative to P5.

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