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It turns out that 5400 meters or 18,000 feet is the half-pressure (500 millibars) altitude. Pressure and weight are proportional for the same gas. Don't make the mistake of thinking that doubling that gets you to the edge of the atmosphere. The atmosphere gets thinner and thinner, so the remainder of the atmosphere goes and goes and goes, with no actual boundary you can point to.

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Q: Approximately how high is half the weight of the atmosphere?
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