What performance metric shows the incredible efficiency of ion thrusters compared to chemical rockets?

Answer

Specific Impulse ( ext{I}_{ ext{sp}})

Specific Impulse ( ext{I}_{ ext{sp}}) is the measure used to describe the propellant efficiency, where ion thrusters boast values far exceeding traditional chemical rockets, meaning they use significantly less propellant mass for the same velocity change.

What performance metric shows the incredible efficiency of ion thrusters compared to chemical rockets?

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