How Bullets fly
Skipping the intro, bullets gain all of their kinetic energy from expanding gas. When the trigger is pulled, the firing pin in the gun comes forward and ignites the gun powder in the shell. The chemical energy stored in the powder is then convert into heat which cause the temperature of the the air between the bullet and the shell to rise rapidly. Remembering the equation from last year PV/T=PV/T this shows that when the temperature increases ether the pressure or volume has to increase also. In this case, the first thing to increase is the Pressure and this increase pressure creates a force on the bullet that sends in flying out of the barrel. All of this happens in a fraction of a second.
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