Any literature on the big bang usually describes the initial moments as hot and dense. The laws of thermodynamics point to a universe where entropy is increasing, so given the assumption the universe is a thermodynamically isolated system, this implies a low entropy big bang. given that minimum entropy is irrevocably associated with absolute zero, how can the big bang be both hot and cold at the same time? I have thought about this over many years and have only ever come up with one way that this apparent paradox can be resolved. Can anyone describe to me simply what standard big bang cosmology has to say on this matter?