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Questions and Answers
What is the primary factor that determines the amount of water vapor in the atmosphere?
Which of the following best describes the relationship between relative humidity and absolute humidity?
How does air density change as altitude increases?
What is the relationship between air temperature and the dew point temperature?
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Which of the following best describes the relationship between relative humidity and air density?
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Study Notes
- Water vapor, although a small fraction of air mass, significantly affects flight by lowering air density as it is lighter than air.
- Humidity, influenced by water vapor in the atmosphere, varies widely based on location and time, impacting human comfort.
- Factors affecting air density include altitude (density decreases with increased altitude), temperature (density decreases as air expands with higher temperature), and humidity (density decreases as lighter water vapor displaces other molecules).
- In the troposphere, as altitude increases, air temperature, density, and pressure decrease, with pressure having a greater impact on density.
- Aircraft and engine performance decrease with reduced air density at higher altitudes due to decreased resistance.
- Half of all air molecule mass is below 5500m altitude, highlighting the significant impact of air density on aircraft performance.
- The atmosphere, crucial for life on Earth, is composed of various factors like pressure, temperature changes, and different layers like troposphere and stratosphere.
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Description
Learn about how water vapour affects air density and its impact on flight. Discover how the less dense air near the Earth's surface behaves due to the presence of water vapour.
