This may help to explain the figures Rick Gold posts on the door of the ERC
trailer and why they can change during the day.
Begin forwarded message:
> From: Thomas Kirkham
> Date: August 5, 2010 3:07:12 PM MDT
> To: Wester Potter
> Subject: air density
>
> Interesting article on air density.
>
> http://wahiduddin.net/calc/density_altitude.htm
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