Question

What do the following indicate in a barometer regarding weather. (i) Gradual fall in mercury level. (ii) Sudden fall in mercury level. (iii) Gradual rise in mercury level.

Answer 1

Answer:

Gradual fall in mercury level =The weather is going to be bad like stormy weather or thundering clouds.S

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Answer 2

To find:

What does the following situations indicate in a barometer?

• Gradual fall in Mercury level

• Sudden fall in Mercury level

• Gradual rise in Mercury level

Solution:

Level of mercury in a barometer refers to the atmospheric pressure at that region. If the level of mercury is high, it signifies a high atmospheric pressure and vice versa.

Gradual fall in Mercury level:

• It signifies that the atmospheric pressure at the region has become low. If the relative humidity in the atmosphere is high, there there is a possibility of rain in that area.

Sudden fall in Mercury level:

• It signifies that there has been a fast fall in atmospheric pressure over the region. This will pool air from the surrounding regions vigorously and there is a possibility of storm in that area.

Gradual rise in Mercury level:

• It refers to dry and calm weather.

• There is no possibility of rain.

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