seriously disabled Posted August 23, 2008 Share Posted August 23, 2008 (edited) If air flows away only in the upper troposphere, why does it leave less mass on the surface? http://www.weatherquestions.com/What_causes_low_pressure.htm Edited August 23, 2008 by swansont fixed link Link to comment Share on other sites More sharing options...
DJBruce Posted August 23, 2008 Share Posted August 23, 2008 I might be wrong but I believe the atmosphere is at or very close to equilibrium between the gases floating away and the earths gravity pulling them to the ground. Link to comment Share on other sites More sharing options...
swansont Posted August 23, 2008 Share Posted August 23, 2008 Less mass per unit area. The expansion pushes air out of the way, so overall it is slightly less dense. Link to comment Share on other sites More sharing options...
CaptainPanic Posted August 25, 2008 Share Posted August 25, 2008 If you remove some air at the top, then less air is pushing down... which is exactly what happens in a low pressure. (Low pressure, less pushing down). Low pressure means lower density. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now