This was on TV Tropes:
"In Metroid, Brinstar is full of some kind of acid that depletes your energy by roughly twenty points per second of contact. Considering the sort of damage the power suit can endure, that makes it about as strong as 10-12M HCl. The acid is also boiling, looking at its animation, which means that, if it is HCl, the air in Brinstar must be largely chlorine gas. The stuff is also a serious threat in the Metroid stages featured in the first two Super Smash Bros. games; the lava filled the pit at the bottom of the stage and constantly rose, often to the point where the only available fighting space was a tiny platform. Any character who touches it is launched skyward."
Perhaps we could use it in the article? Sylux X 00:52, January 2, 2014 (UTC)