 Carnot's theorem (thermodynamics)

Carnot's theorem is a fundamental principle in thermodynamics that provides important insights into the efficiency of heat engines. Formulated by the French physicist Sadi Carnot in the early 19th century, the theorem states: 1. **Maximum Efficiency**: No heat engine operating between two heat reservoirs can be more efficient than a Carnot engine operating between the same two reservoirs. The efficiency of a Carnot engine is determined solely by the temperatures of the hot and cold reservoirs.