Re: Heating a City

In rec.arts.sf.science message <060420082302138149%dmpalmer@[EMAIL PROTECTED]
>,
Sun, 6 Apr 2008 23:02:13, David M. Palmer <dmpalmer@[EMAIL PROTECTED]
> posted:
>
>The air is 0.3% less dense than the cold air (assuming that is 20 F
>degrees--double that for 20 C degrees.

Absolute zero is about -460 deg Fahr, and a rise of 20 deg Fahr will
change the density by about 4.5%.  20 degrees Celsius will change the
density by about 7.5%.

-- 
 (c) John Stockton, nr London UK.
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