 William Thomson (Lord Kelvin) was the first to use the word "demon" for Maxwell's concept, in the journal "Nature" in 1874, and implied that he intended the mediating, rather than malevolent, connotation of the word.The second law of thermodynamics ensures (through statistical probability) that two bodies of different temperature, when brought into contact with each other and isolated from the rest of the Universe, will evolve to a thermodynamic equilibrium in which both bodies have approximately the same temperature.The second law is also expressed as the assertion that in an isolated system, entropy never decreases.