Properties of Matter 2 Question 18
18. A barometer made of a very narrow tube (see figure) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is $0.00018 /{ }^{\circ} C$ and that of the tube is negligible. The temperature of mercury in the barometer is now raised by $1^{\circ} C$ but the temperature of the atmosphere does not change. Then, the mercury height in the tube remains unchanged.
$(1983,2 M)$
Analytical & Descriptive Questions
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Answer:
Correct Answer: 18. (a) Zero
(b) $0.25 cm$
(c) $g / 6$
Solution:
- On increasing the temperature of mercury its density will decrease. Hence, level of mercury in barometer tube will increase.
