We know, the rockets in space use Newton's 3rd law to increase their velocity and hence move. What I don't understand is how it is possible in space aka vacuum-state without air? From what I know, Joule's "Free Expansion of Gas" says that free-expansion compresses the gas and is therefore "affected" by vacuum so it can't make the rocket move as the gas will have zero press/force. Could someone please explain me how rockets do really work and the above-mentioned statement?
Actually, please have a look at this site: http://cluesforum.info/viewtopic.php?f=23&t=1632
Not: The site appears to include some conspiracy theory thingummies, but made me wonder anyway.
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