Very low pressure is expressed in microns (μ), which is equal to ____________ mm of Hg column (absolute) at 0°C?
Correct answer: B. 0.001
- A. 0.0001
- B. 0.001
- C. 0.01
- D. 0.1
Explanation
One micron of mercury is 0.001 mm Hg because the prefix micro means one-thousandth in this pressure convention. Thus 1 μHg corresponds to 0.001 mm Hg absolute.
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