What happens to atmospheric pressure for every 2000 feet of elevation gain?

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The correct response is that atmospheric pressure decreases with an increase in elevation. As you ascend, the weight of the atmosphere above you is reduced, leading to lower atmospheric pressure. Specifically, atmospheric pressure decreases by about 1 inch of mercury (inHg) or approximately 0.5 psi for every 1,000 feet gained in elevation, although this can vary slightly depending on local conditions.

While option C refers to changes in pressure, it inaccurately describes the relationship between elevation and pressure changes. In particular, it confuses the behavior of absolute pressure (psia) and gauge pressure (psig). At higher elevations, although psig, or gauge pressure, may seem to show changes, it is primarily the absolute pressure (psia) that decreases as you gain elevation.

This situation means that atmospheric pressure does not remain constant—it decreases progressively as you ascend, indicating that the correct understanding of how atmospheric pressure behaves with elevation is vital. Measurement in psi or other pressures depends on understanding both absolute and gauge measurements, but the key takeaway is the natural decrease of pressure with elevation gain.

Thus, the most accurate observation is that atmospheric pressure decreases linearly with elevation, making that the more scientifically supported perspective.

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