A New Thermodynamics

Blog: Atmosphere: Thermal and Pressure Equilibrium

By Kent W. Mayhew


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Atmosphere: Thermal and Mechanical Equilibrium

We previously discussed the new conditions for thermal equilibrium in closed systems.Thermal  Equilibrium in Closed Systems 

Now consider a region of our atmosphere which is in thermal equilibrium: This now means that over a specified time frame:

1)      The polyatomic gas molecules absorb as much blackbody/thermal radiation, as they radiate, hence maintain a constant vibrational energy (atmosphere is mainly diatomic gases), which is a function of temperature. Note this will also be a function of elevation i.e. pressure i.e. mean molecular volume

2)     The gas molecules experience inelastic intermolecular collisions hence obey conservation of momentum and this means that pressure is conserved.! Hence inelastic collisions implies that thermal/blackbody radiation is given off during collisions in order for energy to be conserved, and this radiation becomes part of the above described 1)!

3)      The gas molecules equally (give vs take) exchange vibrational energy with each other. In general net flow of vibrational energy in any direction will be zero. 




Our atmosphere is the mother of all heat baths


Forms of work during expansion:

    It took work to form our atmosphere, hence it takes work to displace our atmosphere this can take two forms:

  1) Lost Work

   2) Negative Work 


To understand the differences in expansion and compression systems within our atmosphere: click here


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This website is copyright of Kent W. Mayhew who in 2018 resides in Ottawa Ontario Canada
   This website is full of new ideas, which are the property of Kent W. Mayhew.  
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