Jisho

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Noun
1. specific impulse; specific thrustEngineering term
Wikipedia definition
2. Specific impulseSpecific impulse (usually abbreviated Isp) is a way to describe the efficiency of rocket and jet engines. It represents the derivative of the impulse with respect to amount of propellant used, i.e. , the thrust divided by the amount of propellant used per unit time. If the "amount" of propellant is given in terms of mass (such as kilograms), then specific impulse has units of velocity. If it is given in terms of Earth-weight, then specific impulse has units of time.
Read “Specific impulse” on English Wikipedia
Read “比推力” on Japanese Wikipedia
Read “Specific impulse” on DBpedia

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