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what is the gravity level above the sea ?

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  1. Skyfox on Feb 03, 2017

    In 22 years of aviation I’ve never heard the term gravity level. Even doing a quick google search I can’t find anything about that term. Are you talking about the force of gravity at sea level and as you go up in altitude? If so, that’s 1 G at sea level. As you go up in altitude and therefore move farther away from the center of Earth’s mass the change in the force of gravity is absolutely negligible. Gravity follows the inverse square law, which states that a change in your distance from something reduces its gravitational effect by the amount of that change; for example, doubling your distance would result in 1/4 the amount of gravity. But since the average distance from the center of the Earth is almost 4000 miles, you’d have to be at an altitude of about 4000 miles above the surface to have that much reduction in gravity. Let’s say you were flying 1 mile up in altitude above sea level. That would make the force of gravity acting you be (1/4000)² or 1/16,000,000 less than you’d feel sea level, or .9999999375 G. Like I said, absolutely negligible.

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