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The Tsiolkovsky rocket equation, classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity can thereby move due to the conservation of momentum.
Given the effective exhaust velocity v e {\displaystyle v_{\text{e}}} , a desired delta-v , and a given dry mass m f {\displaystyle m_{f}} , the equation can be used to find the required wet mass m 0 − m f {\displaystyle m_{0}-m_{f}} :
So the necessary wet mass grows exponentially with the desired delta-v, as illustrated in a chart above.