The gases are sealed in, but they're certainly not compressed to operating temp
especially now we've banned all those delicious CFCs. You still have to compress the system up to a certain charge before it will have any noticeable effect, hence "to charge."

Anything else you want to argue with?
( Grrrmachine the indifference engine, Thu 11 Jun 2009, 19:18, archived)

Yes, pick a topic.
I'm a world leading expert.
( Dave Trouser ; the people's choice - 75% agree, Thu 11 Jun 2009, 19:19, archived)