Newton's third law of motion, chemical reactions, and our ability to harness them form the basis of propulsion. Missile propulsion can be broken down into several main categories. The most important are Thrust, Impulse, Momentum, ISP and the differences between Solid Grain Propellant and Liquid Propellants. Thrust in a missile is equal to the timerate of momentum change of the exhaust gas accelerated from the combustion chamber through the nozzle. This is the exhaust velocity with respect to the missile, which can be seen in this equation: T=m-dot*v. Thrust is the force that propels a missile and is measured in pounds, kilogrammes or Newtons. To create a high exhaust velocity, the necessary high pressure and temperature must exist for combustion of fuel. Mass flow rate m-dot can be increased by increasing the nozzle throat area.
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