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The Atmosphere

This text explores key concepts of atmospheric physics, focusing on how altitude affects aircraft behavior and gas expansion. At high altitudes, passenger jets fly with a nose-up attitude due to decreased air density, requiring them to push more air downwards for lift. Additionally, as balloons ascend, they expand because of the reduced external air pressure. The weight of air goes unnoticed under normal conditions, similar to water immersion, but becomes apparent in environments lacking an atmosphere. This discussion also touches on the perceived weight differences in compressed gas bottles.

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The Atmosphere

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  1. 36 The Atmosphere Conceptual Physics Text Correlation: Section 20.1

  2. Why does a passenger jet flying at high altitude fly with more of a nose-up attitude than when it is flying at low altitude? Answer: At high altitudes there is not much air to "ride on." Consequently, an aircraft must push a greater volume of air downward. It does this by flying with more of a nose-up attitude so that the wings deflect the air down more strongly. Question 1

  3. Why does a balloon expand when it ascends? Answer: It expands because there is less air pressure outside acting on it to keep it small. Question 2

  4. Why do we not notice the weight of air? Answer: We don't notice the weight of air just as we wouldn't notice the weight of water in a plastic bag if we were submerged in water (see Figure 20.3 in the textbook). If we were on the moon, where there is no atmosphere, and a bag of air were handed to us, we'd notice its weight. Question 3 • Those steel gas bottles of compressed gases used in hospitals are noticeably lighter when they're empty.

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