I would say the gas would need to be around 130 degrees F. Thats approximate maybe have a range of +/- 20 deg.F. I'm not sure what the container would be yet. My guess would be carbon fiber, fiberglass. Maybe aluminum. Most likely carbon fiber. Like I said it would be contained so breating it would be unlikely, but may be a concern in the event of the container rupturing. So safety of the gas is somewhat of a concern. I'm not sure how much more I can explain without giving away what it is. Like I said I don't have a patent yet. If you need more details let me know and i'll try to answer as best I can. Thanks for the ideas so far.
Merged post follows:
Consecutive posts mergedI guess it could be like a gel(if it could be heated?), it wouldn't have to be a gas. I just wouldn't be able to be very dense.