Chemistry
Nernst Equation
E = E° − (RT/nF)·ln Q

A Daniell cell's voltage slides down the logarithm of Q, sitting at the standard 1.10 V when reactants and products are at unit activity.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).