Question

How does the atmospheric pressure change with altitude?

• A. Altitude increases, pressure decreases
• B. Altitude decreases, pressure decreases
• C. Altitude increases, pressure increases
• D. Altitude is independent of pressure

Answer 1

The correct option is A

Altitude increases, pressure decreases

Atmospheric pressure: It can be defined as the total weight of air over a unit area at any given elevation.

As the height increase, the amount of air over a unit area decreases. Hence, the atmospheric pressure will reduce too.

Explanation for the correct options:

Option A:

1. As altitude increases, the amount of air over a unit area decreases.
2. Therefore, the atmospheric pressure will reduce due to lower air molecules.
3. Hence, this is the correct option.

Explanation for the incorrect options:

Option B:

1. As altitude decreases, the amount of air over a unit area increases.
2. Therefore, the atmospheric pressure will increase due to the high amount of air molecules.
3. Hence, this is not the correct option.

Option C:

1. As altitude increases, the amount of air over a unit area decreases.
2. Therefore, the atmospheric pressure will reduce due to lower air molecules.
3. Hence, this is not the correct option.

Option D:

1. According to the definition of atmospheric pressure, it is clear that it depends on the altitude.
2. Hence, this is not the correct option.

Hence, option A is the correct option.