ISA, Pressure Altitude & Density Altitude Explained | Aviation Meteorology Full Lesson

A runway can sit at 2,000 feet above sea level, but on a hot summer afternoon, your aircraft may perform as if it's struggling to get airborne from a 5,000-foot mountain strip. This full lesson explains the International Standard Atmosphere (ISA), the exact difference between physical elevation and pressure altitude, how to calculate ISA temperature and deviation, and how to use the standard 120-foot density altitude formula. New channel: we're building a library of helicopter and aeroplane theory lessons for RPL, PPL and CPL students. Subscribe so you don't miss the next one, and comment the topic you want covered. 🛫 Practice questions, PEXO exam simulators, and interactive study binders: • 🇦🇺 Australian Pilot Training (CASA RPL · PPL · CPL & RePL): https://www.aeroacademic.com.au/beta • 🇺🇸 US Pilot Training (FAA Private · Commercial · Part 107): https://www.aeroacademic.com/pricing Chapters 0:00 Introduction & Cold open 0:55 The International Standard Atmosphere (ISA) 2:00 Elevation versus Pressure Altitude 3:28 ISA Temperature and Deviation 4:16 Density Altitude: What the aircraft feels 5:26 The performance penalty of thin air 6:15 Recap 6:45 Outro How this video is made: the narration uses synthetic voices, and the diagrams are drawn from the script rather than generated by AI. Every fact is checked against the sources below, and the source is shown on screen as each fact appears. Spotted an error? Tell us in the comments and we'll correct it. Sources: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25B), chapter 11 ("Aircraft Performance", pp. 11-1 to 11-5) and chapter 12 ("Weather Theory") · CASR Part 61 Manual of Standards, Schedule 3, MET 1.1 and PERF 1.1. Study material only, not flight instruction. Always follow your aircraft's flight manual and your instructor. Aero Academic is an independent study platform and is not affiliated with or endorsed by CASA or the FAA. #aviation #densityaltitude #pressurealtitude #meteorology #CASA #FAA #pilottraining