This video reviews how air density affects aircraft performance and spells out the differences between pressure altitude and density altitude. Information from the video is pulled straight from the Pilot's Handbook of Aeronautical Knowledge (PHAK). Topics included are the atmospheric pressure at sea level, how to calculate pressure altitude and density altitude, and the effects that different barometric pressure and altimeter settings have on the indicated altitude readings in an airplane. Great refresher for pilots getting ready for flight review or check ride.

0:08 What is Density Altitude?

0:18 How Density Altitude Affects Aircraft Performance

0:40 3 Reasons Why Aircraft Performance Decreases in High Density Altitude as Air Becomes less Dense

1:04 Air Density and Air Pressure at Sea Level

1:32 Air Density and Air Pressure at One Mile High – Effects on Aircraft Performance

2:00 Atmospheric Pressure

2:06 Atmospheric Pressure and Altimeter Setting at Sea Level

2:21 Standard Atmospheric Pressure Lapse Rate

2:32 Standard Temperature Lapse Rate

2:51 What is Pressure Altitude?

3:00 What is an Altimeter?

3:18 What is the Standard Datum Plane?

3:40 How to Determine Pressure Altitude?

4:04 How Barometric Pressure affects Altitude Readings on an Altimeter

5:36 Effects of Temperature on Density Altitude