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.

Nitrogen, Oxygen, Water Vapor, Carbon Dioxide,

Possibly: Propane, Butane, Methane (If you have a lighter, butane, 
natural gas: methane, gas grill: propane)

In small amounts: Neon (little orange lamps seen on some electrical 
equipment), maybe Argon (some light bulbs)...

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