Pressure altitude is the height above a standard datum plane (29.92 inHg at sea level), used to calculate aircraft performance in non-standard atmospheric conditions. It's calculated using the formula ...
Density altitude (DA) reduces aircraft performance; it's pressure altitude corrected for nonstandard temperature and humidity. High temperature, humidity, and elevation all contribute to higher DA.
The achievement is "one of those unforgettable peaks that define great human and technological adventures," the SolarStratos mission said in a statement.
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