Hello,
Just messing around with gas equalize volume. For some reason it acts strange on large objects. Instead of expanding outward, it just freaks out. If you look at the visualization, sometimes it shows negative divergence, even with a positive number. The sources are the same except for the scale of the cubes.
edit: I looked at the example scene for the gas equalize volume, and it only works on small containers too. If you make the container bigger it explodes.

hmm, found a fix. Bigger objects need more substeps.