What is the outermost layer of the atmosphere that contains almost no air molecules?
The exosphere is 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. ChaCha on!
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