Practice question

What standard sea-level temperature and atmospheric pressure values define the International Standard Atmosphere (ISA)?

  1. 0°C and 1000.0 hPa
  2. 15°C (59°F) and 1013.25 hPa (29.92 inHg)
  3. 20°C (68°F) and 1020.0 hPa
  4. 25°C (77°F) and 1015.0 hPa

Answer: B — 15°C (59°F) and 1013.25 hPa (29.92 inHg)

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