In 1819, two French scientists, Pierre Dulong and Alexis Petit, proposed the first direct approach to calculating atomic weights. They proposed that the amount of heat required to raise the temperature of a single atom of a solid by a given amount...

The Dulong-Petit law, a chemical law proposed in 1819 by French chemists Pierre Louis Dulong and Alexis Thérèse Petit, states the classical expression for the specific heat capacity of a crystal due to its lattice vibrations. The result is extremely...