= Manometer
An instrument for measuring <pressure> relative to another <pressure>. A liquid-column <manometer> uses <hydrostatic pressure>; a digital <manometer> uses a <pressure transducer>.
The appeal of a <liquid>-column <manometer> is that a <pressure measurement> becomes a visible <length> measurement: <mass density> and <gravitational acceleration> supply the conversion. It can compare two <pressure tappings> in a flowing <fluid>, even though the measuring <liquid> itself must settle into <hydrostatic equilibrium>. The reference connection determines which <pressure> difference is being measured.
Back to article page
