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“exosphere”
exosphere
1. The outermost region of the atmosphere of the earth or another planet.
2. An outermost region of the earth's atmosphere, estimated at 300-600 miles, or 500-1000 kilometers, where the density is so low that the mean free path of particles depends upon their direction with respect to the local vertical, being greatest for upward-traveling particles.
2. An outermost region of the earth's atmosphere, estimated at 300-600 miles, or 500-1000 kilometers, where the density is so low that the mean free path of particles depends upon their direction with respect to the local vertical, being greatest for upward-traveling particles.
Its lower boundary is often called the critical level of escape, where gas atoms are so widely spaced that they rarely collide with one another and have individual orbits or where atmospheric pressure is very low because the gas atoms are very widely spaced and the temperature is very low.
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“exosphere”
exosphere
The outermost layer of the earth's atmosphere.
The exosphere goes from about 400 miles (640 km) high to about 800 miles (1,280 km). The lower boundary of the exosphere is called the "critical level of escape", where atmospheric pressure is very low (the gas atoms are very widely spaced) and the temperature is very low.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 10)
exosphere
Considered to be the final layer where the atmosphere fringe begins at 435 miles (700 kilometers) above the earth's sea level.
This entry is located in the following unit:
Meteorology or Weather Terms +
(page 3)