My TED talk is about how combustion works and how it can benefit the world.  Combustion works with pressure, volume, and velocity. In order to trigger the combustion, you must have a hydro propellent that when you ignite it will burn oxygen causing the combustion. A hydro propellent is a  type of gas that will cause the oxygen to burn when ignited. Hydro propellants are commonly found in most hair spray products.

If you ignite the propellent from the back, the propellant ignites, and pressure causes the object you’re firing to move down the barrel, when it does this, the volume behind the object expands. As this volume increases, if the burn rate does not keep up, the pressure will fire your object into the sky. But if you Ignite the propellent from the middle of the combustion chamber, when the “explosion” moves towards the closed off  end of the combustion chamber, unless the fuel/air mixture is just perfect,sometimes you will run out of oxygen and have unburned fuel. This creates a compressed pocket of fuel in the back of the combustion chamber, that remains unburned, until it turns into a rarefaction (a reduction in the density of something, especially air or a gas) and pulls more oxygen back in through the barrel to burn the unburned compressed pocket of fuel.

Combustion can benefit the world because most canons on American Navy ships are operated by combustion chambers. These canons are used for artillery strikes for targets on land at a far distance, naval warfare, and most commonly used as anti-aircraft weapons. Most assault rifles as early as the 1855 Springfield Musket, used in the American Civil War have small combustion chambers used to fire at targets at long ranges, these combustion chambers are larger in most snipers. Handguns such as pistols work differently. Instead of combustion chambers, handguns have a small but powerful hammer so when the trigger is pulled, the hammer snaps forward and a pin hits the primer, when the pin hits the primer, it creates a spark, this spark ignites the gunpowder and the explosion propels the bullet out of the barrel of the gun.