Practice question

What is the standard ISA temperature lapse rate in the troposphere up to an altitude of 36,090 ft (11 km)?

  1. 1.0°C per 1,000 ft (3.0°C per 1,000 m)
  2. 1.98°C (approx 2°C) per 1,000 ft (6.5°C per 1,000 m)
  3. 3.0°C per 1,000 ft (10.0°C per 1,000 m)
  4. 0.5°C per 1,000 ft (1.5°C per 1,000 m)

Answer: B — 1.98°C (approx 2°C) per 1,000 ft (6.5°C per 1,000 m)

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