escape velocity


escape velocity

noun

Definition of ESCAPE VELOCITY

:  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

1934

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.

Browse

Next Word in the Dictionary: escapeway
Previous Word in the Dictionary: escape valve
All Words Near: escape velocity

Seen & Heard

What made you want to look up escape velocity? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More