Page:Reflections on the Motive Power of Heat.djvu/210

186 From this result we draw the following conclusion:

47. Equal volumes of all elastic fluids, taken at the same temperature and pressure, when compressed to smaller equal volumes, disengage equal quantities of heat.

This extremely remarkable theorem of Carnot's was independently laid down as a probable experimental law by Dulong, in his "Récherches sur la Chaleur Spécifique des Fluides Élastiques," and it therefore affords a most powerful confirmation of the theory.