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Question
Vidhya feels that mercury is costly. So, instead of mercury she wants to use water as a barometric liquid. Explain the difficulty of constructing a water barometer.
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Solution
- Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure.
- A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.
- This is because mercury is 13.6 times denser than water.
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| Column I | Column II |
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| b) Increasing area of contact | ii) Atmospheric pressure |
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