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प्रश्न
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.
उत्तर
- 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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संबंधित प्रश्न
Match the following.
| Barometer | reduce friction |
| Increasing area of contact | Atmospheric pressure |
| Decreasing area of contact | cause of friction |
| Lubricants | increases friction |
| Irregular surface | decreases friction |
The instrument used to measure atmospheric pressure is ______.
Describe the construction and working of mercury barometer.
A mercury drop of radius 'R' is divided into 27 droplets of same size. The radius 'r' of each droplet is ______.
When a mercury drop of radius 'R', breaks into 'n' droplets of equal size, the radius 'r' of each droplet is ______.
Let 'R1' and 'R2' are radii of two mercury drops. A big mercury drop is formed from them under isothermal conditions. The radius of the resultant drop is ______.
______ is the instrument used to measure atmospheric pressure.
______ is a device for measuring atmospheric pressure without the use of liquids.
The barometer works by balancing the Mercury in the glass tube along with the outside air pressure.
Match the following.
| Column I | Column II |
| a) Barometer | i) reduce friction |
| b) Increasing area of contact | ii) Atmospheric pressure |
| c) Decreasing area of contact | iii) cause of friction |
| d) Lubricants | iv) increases friction |
| e) Irregular surface | v) decreases friction |
