Delta-v (Δv), literally 'change in velocity', is a scalar measure of the impulse that is needed to perform a maneuver such as orbital changes performed in spaceflight. It is a function of the thrust of the engine, and its burn time, and is measured in units of velocity (m/s or km/s). Delta-v is a critical parameter in mission planning, determining the amount of propellant required for a given maneuver or mission.
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