Sorry for the massive post.

Hi Distimpson thanks a lot, looks awesome, I must ask though how accurate is that energy conversion factor for Octanitrocubane, The researcher who pioneered the molecule is a prof at the uni of chicago, I have his email and number, and will try to contact him to see If hopefully he'll give me an energy conversion factor.

I guess we kinda think alike, after a while of research I also remembered PV=nRT However there are problems (more on that a little further down), Since the detonation velocity is so fast and the propellant will be in such a small volume of space in crystal form, the full sublimation into gases should be almost instantaneous. So it detonates and releases all gas before the bullet begins to dislodge or at least displaces a small amount, I can allways account for that later. Now freeze hold this moment in your mind.

Distimpson just as you did, Using the internal volume for the casing (8.7614922 e-7 m3) and the density of the solid explosive (1980) I got the mass that would fit in that volume (1.7347755 e-3 kg). Now using mass over Mr (464.13) I can get the moles (3.7376931 e-6 moles of solid Octanitrocubane). Multiply by avogadro's constant and I have the number of molecules of the explosive in the chamber (2.2508916 e18 molecules of solid ONC).

I know that 1 molecule of the explosive becomes 8 molecules of CO2 and 4 of N2. So multiply the number of molecules of the explosive I calculated earlier by 8 and 4 respectivly. Now I know the number of molecules of CO2 (1.8007133 e19 molecules) and N2 (9.0035664 e18 molecules) that would be generated by the amount of the explosive that fitted in that space. Divide both by avogadro's constant and I have the number of moles of both. Add them up and now I know the number of moles of total gas in the chamber (4.4852317 e-5 moles). However if one were to use the Volume in Dm3 divided by 24 formula, the number of moles is much smaller value (3.6506217 e-5 moles). How do I figure out the compressibility factor in order to use PV=ZnRT.

Also since these are extreme temps and pressures I am going to use the Redlich–Kwong model for corrections.

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

Unfortunately using the reddlich-kwong corrections, I am having trouble finding the table of references that display the values for a and b for specific gases (in my case CO2 and N2). I'm not sure if any of you have had to work with this before but I thought to ask anyway.

So I am basically rearranging to calculate the pressure at the chamber.

So now I have a value for n (number of moles), V (internal volume of the casing), R is a constant. And like I said, I am trying to track down an energy conversion factor for Octanitrocubane so I can figure out the maximum temperature in that chamber (get a value for T). But for now I'll use yours.

My next goal is to calculate rate of change of pressure with change in volume (as the bullet travels down the barrel.) and rate of change of pressure with change in temperature (as heat is transferred to the surroundings and the gases cool down), and put those two together, but first I need that P.

Also, like you said, there will allways be losses. Unfortunately as much as I like to belive that it's possible to calculate a drag coefficient without conducting experiments, It seems as thought it is the case, so I will just have to find an exhisting coeffiecient for the bullet that is most closely shaped to mine.

Does surface tension of a material affect how much friction it will generate?

Bored Chemist, please define which strengths you are reffering to?

Thanks a lot for all the help, I will have a look at theat book.