How much does atmospheric pressure decrease every 1000 feet elevation?

Atmospheric pressure decreases by about 1 inch of mercury (HG) for every 1,000 feet of elevation gained. This relationship is critical for understanding various applications in meteorology, aviation, and engineering.

As altitude increases, the weight of the air above decreases, leading to a drop in pressure. This decrease is approximately consistent, allowing for predictability in calculations related to air density, weather patterns, and the performance of engines that depend on atmospheric conditions.

This understanding is essential for professionals in fields such as fire service, where knowledge of atmospheric pressure can affect firefighting tactics, equipment performance, and safety protocols at different elevations.