The Big Bang is a widely accepted physical theory describing how the universe expanded from an initial high-density and high-temperature state . It is proposed that the universe emerged from a "primeval atom," filled homogeneously and isotropically with an extremely high energy density, massive temperatures and pressures, and rapidly expanding and cooling. Under the interactions of the four fundamental forces-the electromagnetic force, the strong nuclear force, the weak nuclear force, and the gravitational force-today's world is created by mass condensation. It is similar to the phase transition of gas-solid and gas-liquid, i.e., evaporation (sublimation) -condensation, which has been well-studied in thermodynamics. Therefore, some common physical laws may exist.