Question

Which of the following options is the correct one as per the principle of barometric levelling?

• A. Atmospheric pressure varies inversely with height
• B. Atmospheric pressure varies proportionately with height
• C. Atmospheric pressure varies constantly with height
• D. Atmospheric pressure is zero throughout

Hint:

Barometric levelling is used in altimeters and meteorology to determine altitude by measuring atmospheric pressure, which decreases as height increases.

Answer 1

The Correct Option is A

According to the principle of barometric levelling, atmospheric pressure decreases with an increase in altitude. This occurs because the weight of the air above a point reduces as one ascends to higher altitudes, leading to lower pressure. The relationship is not linear but exponential, indicating that atmospheric pressure and height are inversely related.
Hence, the correct option is: Atmospheric pressure varies inversely with height.