Recent Examples of specific impulse from the Web
Cold gas thrusters can get to a specific impulse of about 70 seconds.
This measures the thrust generated by any given amount of fuel, and liquid engines have a higher specific impulse than solids, which explains a great deal of their attraction.
An electric propulsion engine—such as a Hall thruster that ionizes xenon gas—has a high specific impulse, as much as 10 times that of NTP.
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