escape velocity noun
: the minimum velocity that a moving body (as a rocket) must have to escape from the gravitational field of a celestial body (as the earth) and move outward into space
First Known Use of ESCAPE VELOCITY
escape velocity noun (Concise Encyclopedia)
Speed sufficient for a body to escape from a gravitational centre of attraction without accelerating further. It decreases with altitude and equals the square root of 2 (about 1.414) times the speed needed to maintain a circular orbit at the same altitude. At the surface of Earth, disregarding atmospheric resistance, escape velocity is about 6.96 mi/second (11.2 km/second). Escape velocity from the surface of the Moon is about one-third of this.
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