Second (s or sec) 6
Second (s or sec) 6 :
A unit measuring the fuel efficiency of rocket engines. The measure is obtained as the thrust of the engine divided by the weight of fuel consumed per second (weight being measured at the earth's surface, or at 1 g). Since both thrust and weight are forces, their units cancel and the ratio is measured in seconds. This ratio is often called "specific impulse," although the true specific impulse (measured in speed units) is the ratio of the thrust to the mass (not weight) of fuel consumed per second
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