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And lo on Fri, 11 Jan 2008 12:50:56 -0000, gregjohn <pte### [at] yahoo com>
did spake, saying:
> 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, Argon, Carbon Dioxide, Neon, Helium, Water Vapour; or
what you called "air" :-P
Okay we'll count oxygen as air, unless anyone else can think of a simple
experiment on nitrogen or a molecule thereof; you've also covered water
vapour. Is smoke a gas, I thought it was airborne particulate? Anyway find
an unopened fizzy drink bottle and open it - tada Carbon Dioxide. Do you
have a (natural) gas fire/oven in your house, a barbecue with propane
tanks? Your freezer contains a gas, sure you can't observe it directly,
but you can see how it affects the temperature indirectly. How about the
exhaust on your car, pumping out that carbon monoxide? It depends on what
observations he's required to do.
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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