In this worksheet, we will practice describing the mechanisms of common gas pressure gauges and identifying sources of error in pressure measurements.
A manometer is used to measure the pressure of a gas; the gas exerts a force on a column of liquid in the u-tube, causing it to fall at one end and rise at the other. Which of the following properties would make a liquid a bad choice for use in a manometer?
- ALow vapor pressure
- BHigh density
- CLow reactivity
- DHigh thermal expansion
- ELow toxicity
How would the use of a volatile liquid affect the measurement of a gas using open-ended manometers versus closed-end manometers?
- AIt will introduce a systematic error in both cases.
- BIt would have no effect in either case.
- CIt will not affect the open-ended manometer readings, but will increase the readings for the closed-ended manometer.
- DIt will not affect the closed-ended manometer readings, but will increase the readings for the open-ended manometer.