gregjohn wrote:
> My son has an elementary school homework assignment where he's supposed to do
> simple observations on a solid, liquid, and gas for seven days.  Solids: easy,
> liquids: seven is probably exact the number that is easy to name.  Gases?  So
> far, we've done air, boiling water, and the smoke from cooking fish.  But
> that's about all I can think of without either getting dangerous or overly
> egg-headed.
> 
Oxygen
Nitrogen
Argon
Carbon dioxide (burn something)
Water vapor (normally present when humidity is above zero)
Methane (when people pass gas)
Hydrogen sulfide (ditto)

Hope this helps,
John

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