http://apcnasa3ozl2j74htizuzba5b6nhugbg2qze2nrz43siunkct555fpid.onion
Thus, a chemical propulsion system with an I sp of 400 s would have an exhaust velocity of 12,800 ft/s or 3,920 m/s. To predict the performance of a given set of chemical propellants (fuel plus oxidizer) or a more advanced propulsion system, it is possible to calculate I sp based on the properties of the exhaust gases (temperature, pressure, composition, etc.).