Amusingly, I (Daniel Drucker) originally discovered this while playing with extremely stupid compound units for energy - in particular converting joules back and forth to “atmosphere barn megaparsecs”. Yes, that’s energy.

This would also be a good place to mention my units toy: https://3e.org/units/

Neat. Years ago I did a spike with order-of-magnitude measure sliders. So mosquito mass, with imaginary handcrank force, quickly goes relativistic. And low order 10 kg gives a picture of cat, with high order 100 bpm heart rate beeping (metabolic rate scaling with mass - whale hearts are massive and slooooow). Now with AI, perhaps one might flesh out such a space, with measures and landmarks and media and links, and survive the nightmare barrier of copyright permissions, with a more plausible level of effort. It might be fun to be able to surf an oom measure space, to develop a feel for measures and reasonable quantities.

> “atmosphere barn megaparsecs"

So say a pressure vessel, the length of a galactic cluster, with subatomic cross-section... hmm, ok, an exercise in engineering left for the reader. It seems carbon nanotubes, 1 nm^2 (1e10 barns), can do order 10 GPa, plugged with ice.