In 1862, Thomson published "On the age of the Sun’s heat", an article in which he reiterated his fundamental beliefs in the indestructibility of energy (the first law) and the universal dissipation of energy (the second law), leading to diffusion of heat, cessation of useful motion (work), and exhaustion of potential energy through the material universe, while clarifying his view of the consequences for the universe as a whole.
Aastal 1862 avaldas Thomson artiklis "On the age of the Sun's heat" (Päikese soojuse ajastul), kus ta kordas oma põhilisi uskumusi energia hävimatust (esimene seadus) ja energia universaalset hajumist (teine seadus), mis põhjustab soojuse levikut, kasuliku liikumise (töö) lõpetamist ja potentsiaalse energia ammendumist materiaalse universumi kaudu.