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MarlinJ, Sorry, it was not pointed at your quote. This too is only in response to Mr. Nash's posts/replies throughout the thread. After listing his education I almost got more "snarky" than Bullshop. Decided to just leave it to the imagination about past and recent past "scientific" minds. Even the most basic high school physics class would teach about kinetic energy, inertia, acceleration, momentum, states of matter, compressiblity, etc. Mr. Nash made it a point to cite his education and then got off on the liquid, solid, gas, plasma tangent.... kinda like a scissors, rock, paper level of discussion. As far as internal ballistics and obturation of a "solid" object in a bore (context of this discussion).... of course a solid is NOT compressible nor is a liquid for that matter... but obturation is not about compression... it IS about deformation of a solid "plastic" object... the bullet. With some exceptions, obturation has more to do with inertia and acceleration than with kinetic energy but the ke analogies in other posts are OK and similar enough.
All this reminds me of the movie "Space Cowboys" where the MIT grad, weeny astronaut cites his education yet has some trouble with a concept. Clint Eastwood turns to him and says something like, "maybe you oughta get your money back".
Did I really come in here and cite my educational background as in a "ha ha, my poop don't stink and ya'll are dumber than a box of rocks?"