An absolute pressure of 0.0001 psi can be quantified by a _____________ gauge?
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Answer: A. Mcleod
Explanation
The McLeod gauge compresses a known volume of low-pressure gas to measure high vacuum accurately. Applying Boyle's law allows this instrument to quantify extremely low absolute pressures like 0.0001 psi. Its mechanical compression principle makes it a primary standard instrument for high vacuum measurement. Absolute pressure represents force per unit area measured relative to a complete vacuum. Measuring ultra-low pressures requires specialized techniques to overcome molecular friction and leakage. The McLeod gauge uses mercury columns to trap and compress the sampled gas sample.
High vacuum environments are essential in semiconductor manufacturing, mass spectrometry, and distillation. Accurate vacuum measurement prevents contamination and ensures proper operation of specialized equipment. Industrial vacuum systems rely on dependable gauges to monitor seal integrity and pumping efficiency. Pirani gauges measure vacuum by detecting thermal conductivity changes in heated wire filaments. Thermocouple gauges infer low pressures by measuring temperature variations of a heated sensor element. Saying none of these is incorrect because the McLeod gauge is specifically suited for this task.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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