Because a phenomenon called Bose-Einstein condensation can occur.
Explanation:
Bose-Einstein condensation is a phenomenon that can occur when a scientist works with temperatures close to absolute zero. In this situation, the material being analyzed is compacting, condensing, in a way that could become a large, single atom. When this happens, it is impossible to collect accurate temperature and volume data. This phenomenon occurs in the processes of temperature decay and physical state changes, in which the gas becomes liquid, the liquid becomes solid, and, in this way, the solid would tend to have its particles more and more united.
