Temperature and pressure both vary with altitute.
Variation of Temperature and Pressure with Altitude
Pressure is measured in millibars (mb). 1000 mb is approximately 1 atmosphere.
Over 90% of the earth's airmass lies below 10km.
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© 1998. Centre for Atmospheric Science, Cambridge University, UK. No text or graphics can be used or reproduced without explicit written permission. This version designed and maintained by Dr. Glenn Carver. Original concept and design Owen Garrett.