Edit 11/10/2023:  On re-reading this, I think it’s wrong.  The estimate for the energy radiating into the opening of the mason jar seems right, but the analysis  fails to account for the energy radiating out of the opening of the jar.  The net radiant energy input is much smaller than what I calculate below.  … Continue reading Post G22-007: The math of the mason jar cloche (corrected!).