Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is __________________?
Correct answer: C. Paraffin
- A. Water
- B. Carbon tetrachloride
- C. Paraffin
- D. Ethylene glycol
Explanation
Paraffin has a relatively low density, so a small pressure difference produces a comparatively large liquid displacement in the inclined tube. This makes it suitable for sensitive furnace-draught measurements.
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