[alfa] temp differences and density

[tiefenback@xxxxxxxxxxx]

When I replied to Biba's question, thinking it simple enough for me not to
mess up, I messed up.  When I quoted 30 C as approx. equivalent to 60F, I
was thinking expressly of temperature differences, not the readings on the
scale.  One bemused reader was interested enough in jabbing us poor slobs
south of the border that he emailed me.  I smiled all the way through his
admittedly short email (largely because it meant that at least one person
had actually read what I wrote, by no means a "given" here).  With
absolute (Kelvin) temps near 300, a 30 degree variation is roughly 10% and
the air density would change by about that fraction.  Just keep your PV's
and your nRT's (from the [physics] gas laws) in the right place, and
you'll be OK.

Michael
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