Question

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Answer 1

Answer:

The distance used to calculate the pressure of atmosphere is 75 cm.

Explanation:

• Mercury barometer is used to find the pressure of the atmosphere where it is placed.
• As shown in the figure, the barometer has an inverted tube where mercury has risen by 75 cm. This height is taken into count to measure the atmospheric pressure.
• At the place with high pressure the mercury in the inverted tube will go very high and vice versa.
• Hence to find the pressure we must note down the height of mercury that has risen the inverted tube.