> And to everyone who said CO2 or Ar, that's not something you can observe in your
> house.  It's about observation of gaseous substances, not merely naming off
> elements a textbook will tell you might be present.

CO2 is correct, isn't it. Thinking about water with gas (mainly CO2), baking
process using baking powder (gas CO2), etc.
if your water is a bit limy (or better a bit more) put in acid (vinegar, lemon,
etc.) and there should escape some gas (CO2)...
if you could, brew some beer (CO2)... :)
take a burning candle catch the gas of it with a cup or sth. (take care CO2 is
heavier than air) and then put a burning matchstick inside the collected gas
(it should go out) -> CO2 (fire needs oxygen)

and so on :D

BTW, you were talking about "smelling" fish (organic amines), put lemon on it ->
it shouldn't smell anymore (the acid is helping the amines to become a salt,
they won't raise to your noise anymore) :)

Only to tell a few examples.

Regards,
bluetree

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