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altitude above sea level
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Aspirin pills.
7 Drugs that Changed the World
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Who Invented the Internet?
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Falling Stars: 10 of the Most Famous Endangered Species
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altitude above sea level

meteorology

Learn about this topic in these articles:

barometer

  • How the barometer was invented
    In barometer

    …terms of atmospheric pressure or altitude above sea level. The concept of altitude above sea level, based on barometric pressure, is used to create one type of aircraft altimeter.

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