News for hackers. Stuff that matters.

A comment on A tall chimney to facilitate heat exchange in the atmosphere. Parent comment

Re:A tall chimney to facilitate heat exchange in the atmosphere by kashkhan on Saturday August 05, 2017 @05:31AM (#14934946)
when any gas expands, it does work in expanding against the outside "surface" of the control volume, which comes from the internal energy - temperature - of the molecules.

The equations are commonly derived in thermodynamics undergrad courses. look up adiabatic expansion.

here's a video:

https://www.youtube.com/watch?v=ObnWb7yspxA

[ Parent | on HN ]
Re:A tall chimney to facilitate heat exchange in the atmosphere by abainbridge on Saturday August 05, 2017 @10:05AM (#14935759)
Good point. I stand corrected.

I still think that the radiating-into-space effect I mentioned is real. I imagine this is part of the reason there is convection in the atmosphere. But I'm out of my depth.

[ Parent | on HN ]