Δv (pronounced "Delta-vee") is the maximum change in the velocity of a vessel in space. The Δv in turn determines the manoeuvres that can be carried out by the ship.
For spacecraft using reaction mass
Δv = ve ln m
where ve is the velocity of the exhaust
and m is the mass of the ship plus reaction mass used divided by the mass of the ship
Text by Richard Baker
David Dye (Ad Astra)
Initially published on 09 October 2001.