I believe you made the same temperature conversion error in your post #192 that I made in my post #60 (I corrected it in my post #191).
K = (F + 460) * 5/9
Not K = F + 273
Thank you. My first calc yesterday used an on-line calculator. Today I got sloppy.
273.16 K corresponds to exactly 0.01 °C .018 °F.