That is actually useful trivia (not that I'm building a dirigible or anything, but it's one of those facts I just KNOW will come in handy someday.) I did not know that.

Thanks glatt. Very interesting. I didn't know that factoid. I will need to read some more about it.

Even better, compress the hydrogen to 4000 psi.

Compressed air tanks for paintball guns can run in the 3000-4500psi range. Granted they are around 68 cubic inches, not 340 liters. Minor detail really.

I saw a video the other night of some kid who was killed when one of the paint ball canisters failed. A bit blew off and hit him in the neck.

Sounds like he may have had a faulty burst disc. It's a little piece of safety equipment installed on all compressed air and co2 tanks that is designed to fail when the pressure inside the tank becomes dangerously high, releasing the gasses from the tank quickly and preventing a hazardous over-pressurization. If that malfunctioned and did not fail as it was designed to, then some other part of the tank must have eventually succumbed to the over-pressurization and catastrophically failed, sending pieces of the metal or fiberglass tank flying at high speed no doubt.

Paintball is a very safe sport if safety guidelines are strictly adhered to. All you may end up with at the end of a hard day playing are some bruises/welts and minor scrapes from crawling and sliding around on the ground. When players and field operators/owners/refs neglect their safety equipment like facemasks, barrel blocking devices, gas system, etc., serious injuries, and in this case death, can and do occur. That said, this could have been entirely not the kid's fault. Could have been a cheap tank, not hydro-tested recently, or the fill station operator damaged/overfilled the tank placing this kid in harm's way. I will definitely encourage my future kids to play paintball. It's an exciting, physically demanding, team-building sport that is statistically safer than many other popular sports when safety standards are adhered to.

here's a green electric car:
http://www.zapworld.com/files/images...ectric-car.jpg

yebbut what are those egg shaped things in the background?

I have no idea what it even means. I am stupid about the mechanics of cars. Explain to me please why it is dangrous. Thank you.

I watched this show on NOVA last night about the cars of the future. It was very interesting. http://www.pbs.org/wgbh/nova/car/

Pods, classic. We call them pods. Watch out for Pod People.

You're one of them aren't you ... that explains so much.

It is just a discussion about taking a potentially flamable glass and putting it into a container under great pressure. PSI = Pounds per square inch.

Gases or gases in a liquid phase which become pressurized are potentially more dangerous in that state than at atmospheric pressure.

Well just great. Now I have to kill you.

Ix-nay on the od-pay, assic-clay.

Is compressed air a gas then?