// conversions › 2 · Mechanics & Fluids
Convert rocket specific impulse between seconds and effective exhaust velocity (N·s/kg = m/s) using g₀.
Isp(m/s) = Isp(s) × g₀; g₀ = 9.80665 m/s². Base = N·s/kg = m/s.
It converts convert rocket specific impulse between seconds and effective exhaust velocity (n·s/kg = m/s) using g₀ by first normalising your value to the SI base unit (newton-second per kilogram) and then scaling to your chosen target unit. This hub-and-spoke approach guarantees every unit pair is internally consistent.
300 s to m/s: 300 × 9.80665 = 2942 N·s/kg, then ÷ 1 = 2942 m/s.
They are the same efficiency expressed two ways: the effective exhaust velocity in m/s equals the value in seconds multiplied by g₀ = 9.80665 m/s². The "seconds" figure is popular because it is identical in metric and imperial systems.
Rocket propulsion analysis and launch-vehicle trade studies.
Conversions are exact ratios where the units are defined exactly (most SI and imperial units) and best-available constants otherwise. Extremely large or small magnitudes are shown in general (g) format; round-tripping through the base unit may introduce tiny floating-point differences in the final decimal places.