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Definition of Specific Impulse
Published online by Cambridge University Press: 28 July 2016
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In Rocketry, the definition of Specific Impulse is given variously as Thrust per unit mass of propellants consumed per second and Thrust per unit weight of propellants consumed per second. The second definition is convenient in giving units in seconds, but is unsatisfactory in that the weight of a given mass of propellants depends upon gravitational attraction, and decreases with altitude.
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- Copyright © Royal Aeronautical Society 1953