Correct Option
The correct option isIt falls rapidly.
Explanation
Atmospheric pressure is defined as the weight of the column of air overlying a specific point on the Earth's surface. It is the result of the gravitational force pulling gas molecules toward the Earth.Detailed Analysis:
- Vertical Distribution of Pressure: Air is highly compressible, which results in the highest density of air molecules near the Earth's surface. As one moves upward, the density of air decreases significantly.
- Trend with Altitude: Since pressure is determined by the weight of the air above, moving to higher altitudes reduces the amount of overlying air. Consequently, air pressure decreases as altitude increases.
- Rate of Decrease: The decrease in pressure is not linear; it falls rapidly in the lower atmosphere (near the surface) because the air is densest there. Although the rate of decrease slows down at very high altitudes, the pressure continues to drop throughout all layers of the atmosphere, never increasing or fluctuating.
Key Takeaway: Unlike temperature, which may increase or decrease depending on the atmospheric layer, air pressure consistently falls with an increase in altitude.