Multiple choice

At mean sea level, a difference of one hPa of pressure corresponds to approximately how much change in altitude?

  1. 30 feet

  2. 50 feet

  3. 70 feet

  4. 100 feet
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At mean sea level, 1 hPa of pressure change corresponds to approximately 27-30 feet of altitude change (commonly rounded to 30 feet). This is because pressure decreases with altitude at a roughly constant rate in the lower atmosphere. The other options (50, 70, 100 feet) are too large for a single hPa difference.

Keep practicing — related questions