As a solid, at the right temperature, there are predictions that helium-4 can enter the super-solid state, while helium-3, which is not a boson, will not.

The liquid helium 4 has a very low boiling point of 4.2 Kelvin (about -269 ° C.) under 1 atmosphere, but the temperature of the liquid helium 4 further decreases by decompressing the evaporated ...