Multiple choice

What is the ISA lapse rate for temperature upto 11 km high?

  1. 1.54 Degrees Celsius/1000 feet

  2. 1.98 Degrees Celsius/1000 feet

  3. 2.36 Degrees Celsius/1000 feet

  4. 2.78 Degrees Celsius/1000 feet
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ISA lapse rate in the troposphere (up to 11 km) is 6.5°C per km, which converts to approximately 1.98°C per 1000 feet. This standard temperature decrease rate is used for aircraft performance calculations and flight planning.

Keep practicing — related questions