Specific heat

Each substance requires a certain amount of heat to raise its temperature by 1 degree C. This discovery showed that the specific heat of an element was inversely proportional to its atomic weight.
 Pierre-Louis Dulong and Alexis-Thérèse Petit France 1819 Specific heat

Each substance requires a certain amount of heat to raise its temperature by 1 degree C. This discovery showed that the specific heat of an element was inversely proportional to its atomic weight.