GG140: The Atmosphere, The Ocean, and Environmental Change
Lecture 02 - Retaining an Atmosphere. There are other ways in which we can perceive the existence of the atmosphere, predominantly through our perceptions of pressure. Not all planets have atmospheres, and the existence of an atmosphere depends on the ability of gas molecules to remain trapped close to a planet by its gravitational force. The molecular velocity of each gas molecule depends upon its molecular weight, and must exceed the escape velocity of the planet to leave the atmosphere. (from oyc.yale.edu)
| Lecture 02 - Retaining an Atmosphere |
| Time | Lecture Chapters |
| [00:00:00] | 1. How Do We Sense Pressure? |
| [00:02:59] | 2. Escape Velocity |
| [00:08:48] | 3. Molecular Velocities |
| [00:22:43] | 4. Which Planets have Atmospheres and Why? |
| [00:29:47] | 5. Planetary Characteristics in relation to Their Atmospheres |
| [00:44:35] | 6. Vertical Profile of Temperature in the Atmosphere |
| References |
| Lecture 2 - Retaining an Atmosphere Instructor: Professor Ronald B Smith. Resources: Credit List [PDF]. Transcript [html]. Audio [mp3]. Download Video [mov]. |
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