Energy released in a gunshot explosion

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Discussion Overview

The discussion revolves around the energy released during a gunshot explosion, focusing on the source of this energy and the processes involved in the ignition and combustion of gunpowder. Participants explore the mechanisms of energy transfer to the bullet, gun, and surroundings, as well as the chemical reactions that occur during firing.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant asks about the source of energy released in a gunshot explosion.
  • Another participant explains that the energy comes from the gunpowder in the cartridge, which is ignited by a primer when the trigger is pulled.
  • Questions arise regarding the function of the primer and the process of ignition, with participants seeking clarification on how the gunpowder is ignited and the nature of the rapid expansion during combustion.
  • A later reply describes the primer as a small explosive charge that ignites the gunpowder when struck by a firing pin.
  • It is noted that gunpowder burns quickly due to its self-oxidizing properties, leading to rapid expansion of gases.
  • One participant summarizes that the energy is stored as chemical potential energy in the gunpowder and is converted to kinetic energy upon burning.

Areas of Agreement / Disagreement

Participants generally agree on the basic mechanisms of energy release and the role of gunpowder and primers, but there are ongoing questions and clarifications regarding the specifics of these processes. No consensus is reached on the deeper understanding of the combustion dynamics.

Contextual Notes

Some participants express uncertainty about the details of the ignition process and the nature of the energy transformations involved. The discussion includes references to external sources for further reading, indicating a reliance on existing literature for clarification.

hasan_researc
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Hey,

I have a quick question about the energy released when a gun is fired. When a gun is fired, energy is released in the explosion and is transferred to the gun, bullet and is also used to heat up the surroundings.

My question is: how/why is energy released in the explosion? What is the source of that energy?
 
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The energy comes from the gunpowder stored in the cratridge. When the trigger is pulled, the gunpowder is ignited with a primer, burning the gunpowder and causing a rapid expansion in combustion products which propel the bullet out the muzzle of the gun.
 
Thanks for the answer!

Just so I am clear, what is a primer?

"When the trigger is pulled, the gunpowder is ignited with a primer,":

Why is the gunpowder ignited when the trigger is pulled?

"burning the gunpowder and causing a rapid expansion in combustion products":

Why is there a rapid expansion when the gunpowder burns?

I am wondering if you answered on the top of your head or whether you reaserached and found the answer. If so, how did you actually find it? ::confused::

Thanks again for your help!
 
hasan_researc said:
Thanks for the answer!

Just so I am clear, what is a primer?

"When the trigger is pulled, the gunpowder is ignited with a primer,":

The primer is a very small explosive charge at the back of the bullet. It is ignited when a firing pin hits it.

220px-Bulletfixed1.PNG

See: http://en.wikipedia.org/wiki/Bullet

hasan_researc said:
Why is the gunpowder ignited when the trigger is pulled?

The trigger releases a firing pin which hits the primer on the bullet, igniting the gunpowder charge.

hasan_researc said:
"burning the gunpowder and causing a rapid expansion in combustion products":

Why is there a rapid expansion when the gunpowder burns?

Because that's how gunpowder works! Gunpowder is a self-oxidizing flammable material that burns very quickly when ignited.

http://en.wikipedia.org/wiki/Smokeless_powder

hasan_researc said:
I am wondering if you answered on the top of your head or whether you reaserached and found the answer. If so, how did you actually find it? ::confused::

Thanks again for your help!

I'm a gun enthusiast so I know how guns work, but all it takes to find how they work is to read about them on wikipedia.
 
Another way of putting it;
the energy is stored as chemical potential energy in the gunpowder, then converted to kinetic energy as the gunpowder burns.
 

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