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On Oct 28, 2021, at 1:21 PM, Brian Whatcott <betwys1@sbcglobal.net> wrote:_______________________________________________
SF6 is the most potent greenhouse gas known. It is 22,800 times more effective at trapping infrared radiation than an equivalent amount of CO2 and stays in the atmosphere for 3,200 years.
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Brian On Thursday, October 28, 2021, 11:35:37 AM CDT, Zani, Gerald via Phys-l <phys-l@mail.phys-l.org> wrote:
I will do my best to answer you quickly now and then later will try
to get you some references soon but I have to work on a project first.
There are * TWO! *outstanding, published physics resource letters
about global warming which is where I did research and learned about
the amazing and horrible SF6.
This article discusses CO2 and the physical aspects of the global
warming potential criteria; A Demonstration of the Infrared Activity
of Carbon Dioxide TPT. 57, 246 (2019).
Let me know if you need a copy. It does not discuss SF6.
My wording "storing energy" is misleading, in this context.
Better to describe it as the "quantum mechanical atomic interaction of
SF6 molecule with a particular IR band", the small IR that is most
important for measuring the global warming potential of a gas.
The value for the specific heat doesn't really help to understand the
Global Warming Potential behavior in this context. It is the
vibrational frequencies of a gas that couple with a IR frequency band
and the electric dipole moment of a quantum operator that participates in this interaction.
SF6 over a 100-year period is 22,800 times more effective at trapping
IR than an equivalent amount of carbon dioxide. My 40,000 number was wrong.
But my point was, order-of-magnitude, a correct point; A tiny bit of
SF6 has a disproportionate impact on global warming potential,
compared with CO2.
For years I did the standard greenhouse effect demo that most others
also do. It is a misleading demo that shows more about convection as a
way to trap heat. It is not really a true demo of global warming potential.
A better greenhouse effect demo is described in the published TPT
article cited above.
Best, - Jerry
--
Gerald Zani
Senior Engineering Technician
Brown University School of Engineering
(401) 863-9571
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