Chemistry / Unit 7 Chem 1216 short lesson, about 20 seconds
Manometer
Captions available
The idea
A manometer measures a trapped gas's pressure from the height difference between its two liquid columns.
In practice
A closed-end manometer references a vacuum; an open-end manometer references the atmosphere and must add or subtract atmospheric pressure.
Where people slip
Ignoring which arm holds the reference, vacuum or atmosphere, gives the wrong gas pressure from the same height reading.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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