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  primera_llei_de_la_termodinàmica   conservation_of_energy, first_law_of_thermodynamics, law_of_conservation_of_energy   La_conservation_de_l'énergie, conservation_de_l'énergie, premier_principe_de_la_thermodynamique lei_de_conservación_da_enerxía primera_ley_de_la_termodinámica