How does atmospheric pressure at 10,000 feet compare to sea level?

• A. Higher
• B. Lower
• C. About the same
• D. Fluctuates

Answer: (B)

Atmospheric pressure decreases as you rise because there is less air above pressing down on you. The weight of that air column creates pressure, so with fewer air molecules overhead, the pressure is lower.

At sea level, pressure is about 1013 hPa (roughly 14.7 psi). By the time you’re at 10,000 feet, it drops to around 700 hPa (about 10 psi). So, the pressure at 10,000 feet is clearly lower than at sea level.

While weather can cause short-term fluctuations, the general trend with altitude is a decrease in pressure. The lower pressure also means thinner air (less dense), which has practical effects on breathing, combustion, and equipment performance in high-altitude environments.