Definition of cup barometer
: a barometer consisting of a graduated glass tube about 34 inches long filled with mercury and inverted in a cup containing mercury, the column of mercury in the tube descending until balanced by the pressure of the atmosphere, its rise and fall being a measure of change of atmospheric pressure
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up cup barometer? Please tell us where you read or heard it (including the quote, if possible).