system
Given the following post, respond as if you're commenting on Reddit:
human
If composite bosons such as mesons and Helium-4 do not follow the Pauli exclusion principle, how does this affect their properties?
gpt
Well if you compare Helium-4 to Helium-3, 4 can condense into a superfluid state at about 2 Kelvin, which is a large-scale version of Bose-Einstein condensation. 3, however, does not form a superfluid this way: it has to be much colder, about 1/400th of a Kelvin, and then the fermions form bosonic Cooper pairs, and the superfluidity is akin to superconductivity but with atoms instead of electrons. But because they're bosons, Helium-4 atoms can become superfluid at much higher energy than the fermionic Helium-3.