A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?
Correct answer: C. 269
- A. 26
- B. 42
- C. 269
- D. 325
Explanation
At the same rotameter position, gas flow is approximately inversely proportional to the square root of gas density. With helium-to-air density ratio about 4/29, QHe = 100√(29/4) ≈ 269 cc/s.
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