Which is the most suitable instrument for measuring pressure below 3 microns ?
Correct answer: C. Ionisation gauge
- A. Mcleod gauge
- B. Alphatron
- C. Ionisation gauge
- D. Bourdon gauge
Explanation
An ionisation gauge is designed for very low pressures in the micron and sub-micron range by measuring ions produced in the gas. Bourdon gauges work at much higher pressures, while McLeod gauges are less convenient for continuous measurement.
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