Recent content by spriggig

Thank you. Thank you. This answer kills the idea of *all* gases being invisible, with a picture to confirm: TVP45: "Chlorine and bromine are quite visible, although you don't really want to check." http://newsimg.bbc.co.uk/media/images/40155000/jpg/_40155431_gas2_203.jpg And this answer...

I found this: https://www.physicsforums.com/showthread.php?t=105106 But it the question was never really answered there. So I'd like to ask a *similar* question again. Are there any gases at STP, (without being "excited" or "liquefied"--see other topic, above) that are visible to the naked...