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

The principle of barometric levelling is based on the relationship between atmospheric pressure and elevation. As one ascends in altitude, the atmospheric pressure decreases. This is because the weight of the air above a given point decreases as the altitude increases. Therefore, the correct description of this relationship is that atmospheric pressure varies inversely with height.

Let's consider the options provided:

• Atmospheric pressure varies inversely with height
• Atmospheric pressure varies proportionately with height
• Atmospheric pressure varies constantly with height
• Atmospheric pressure is zero throughout

The correct option is the first one: Atmospheric pressure varies inversely with height. This means as height increases, atmospheric pressure decreases.