It's not a gas at room temperature.
He's heating it, breaking its molecular bonds, and then bottling it.

If it resolidifies, that's the problem of the distributors.
( hexachordal la la la la la, Sun 25 May 2008, 23:05, archived)

*contacts trading standards*
Although I'm not sure if there are any technical precedents on what state matter is referred to, but I would invision that it is unwritten to be at room temperature unless otherwise stated.
(Jeru War and Piss, Sun 25 May 2008, 23:08, archived)

It might
be sealed at a very low pressure.
(Blapto, Tue 27 May 2008, 13:17, archived)