Density Altitude = Pressure Altitude corrected for non-standard temperatures.
With that said, if it was a hot day AT SEA LEVEL and we were experiencing high pressure, I would have a high density altitude.
Conversely, would it be accurate to say that if we were experiencing those SAME HOT TEMPERATURES AT SEA LEVEL on a LOW PRESSURE day, my density altitude would be even higher...due to the low pressure?
Since pressure lowers with altitude and performance is reduced...I would be inclined to believe that HOT TEMPERATURES on a low pressure day leads to worse performance than HOT TEMPERATURES on a high pressure day.
And yes, I realize that each particular elevation has a "standard temperature."
Ahhhhh, the atmosphere and the challenges that it brings us...
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