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    quantitykind:SpecificImpulse
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    http://qudt.org/vocab/quantitykind/SpecificImpulse

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    lang:en
    Specific Impulse
    lang:""
    The impulse produced by a rocket divided by the mass \(mp\) of propellant consumed. Specific impulse \({I_{sp}}\) is a widely used measure of performance for chemical, nuclear, and electric rockets. It is usually given in seconds for both U.S. Customary and International System (SI) units. The impulse produced by a rocket is the thrust force \(F\) times its duration \(t\) in seconds. \(I_{sp}\) is the thrust per unit mass flowrate, but with \(g_o\), is the thrust per weight flowrate. The specific impulse is given by the equation: \(I_{sp} = \frac{F}{\dot{m}g_o}\).
    lang:""
    http://www.grc.nasa.gov/WWW/K-12/airplane/specimp.html