Specific Impulse

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Specific Impulse sp</sub>)</strong> </dt>
A performance parameter of a rocket propellant, expressed in seconds, equal to the thrust F in pounds divided by the weight flow rate Missing Image:img src="SP7_s_files/wdot.gif" align="middle" in pounds per second:

Isp = F / Missing Image:img src="SP7_s_files/wdot.gif" align="middle"

</dd>
Specific impulse is also equivalent to the effective exhaust velocity divided by the gravitational acceleration. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use