Julius von Mayer

Julius von Mayer (1814–1878) was a German physicist and one of the key figures in the development of the concept of energy conservation in physics. He is best known for formulating the first law of thermodynamics, which states that energy cannot be created or destroyed, only transformed from one form to another. Mayer's work laid the foundation for the understanding of the relationship between different forms of energy, such as heat and mechanical work.