A petrol engine, during suction stroke draws

A diesel engine has compression ratio from

If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency of a rocket is given by

The knocking tendency in spark ignition engines can be decreased by adding dopes like tetra ethyle lead and ethylene dibromide.

The unit million electron volts (Mev) is commonly used to measure the nuclear energy.