> most brown dwarfs are slightly smaller than Jupiter (15–20%)
> Brown dwarfs are all roughly the same radius as Jupiter.
The suggestion that Jupiter is "orders of magnitude too small" to be a brown dwarf is obviously wrong in terms of size, but it's also wrong in terms of mass:
> at the low end of the range (10 [Jupiter masses]), their volume is governed primarily by Coulomb pressure
> most brown dwarfs are slightly smaller than Jupiter (15–20%)
> Brown dwarfs are all roughly the same radius as Jupiter.
The suggestion that Jupiter is "orders of magnitude too small" to be a brown dwarf is obviously wrong in terms of size, but it's also wrong in terms of mass:
> at the low end of the range (10 [Jupiter masses]), their volume is governed primarily by Coulomb pressure