Quote from: Shadow Star on January 16, 2007, 08:39:35 PMMy guess...Rapidly releasing a gas that is highly pressurised actually makes it very cold. Example. CO2 canister for pellet guns, fire it quickly and there is a lot of frost and ice on the cylinder. Dont know the physics behind it.I had actually typed out a long, confusing diatribe that said the same thing as this wikipedia entry:As a gas expands, the average distance between molecules grows. Because of intermolecular attractive forces, expansion causes an increase in the potential energy of the gas. If no external work is extracted in the process (â€œfree expansionâ€) and no heat is transferred, the total energy of the gas remains the same because of the conservation of energy. The increase in potential energy thus means a decrease in kinetic energy and therefore in temperature.A second mechanism has the opposite effect. During gas molecule collisions, kinetic energy is temporarily converted into potential energy. As the average intermolecular distance increases, there is a drop in the number of collisions per time unit, which causes a decrease in average potential energy. Again, total energy is conserved, so this leads to an increase in kinetic energy (temperature). Below the Joule-Thompson inversion temperature, the former effect (work done internally against intermolecular attractive forces) dominates, and free expansion causes a decrease in temperature. Above the inversion temperature, the latter effect (increased potential energy associated with collisions) dominates, and free expansion causes a temperature increase.Hope that clears it up?
My guess...Rapidly releasing a gas that is highly pressurised actually makes it very cold. Example. CO2 canister for pellet guns, fire it quickly and there is a lot of frost and ice on the cylinder. Dont know the physics behind it.
Well in short, we called FTL movement as, "Puddle Jumping" and "Space Skipping."
I still dont understand the original idea. I beleive that it was something to do with compressed steam. Im assuming this steam consists of water and ur shooting it on people, somehow freezing them(might needa -50 degree celcius day). Might be easier to burn peole with steam and render them useless for awhile. Not quite sure how or why it works. please explain.
I understadn the basic priciple, but am not quite sure how or if it would work with steam. something like liquid nitrogen may be a better choice.