In article , Stefan "stefan"@mus.
INVALID .ch says...
Eric Greenwell wrote:

On a hot soaring day
at Minden, or elsewhere in the high desert ares, density altitudes can
easily be 8000' or higher.

For breathing, density altitude doesn't matter. It's the pressure
altitude, or more exactly, the partial pressure of the oxygen, that matters.

Thanks for the correction. I was confusing engine operation and lung
operation.
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Eric Greenwell
Richland, WA (USA)