section_path: History/Classical thermodynamics/Clausius (1850)
section_name: Clausius (1850)
paragraph_text: Clausius (1850)
  
  In 1850, Clausius, responding to Joule's experimental demonstrations of heat production by friction, rejected the caloric doctrine of conservation of heat, writing:
  
  The process function Q was introduced by Rudolf Clausius in 1850.Clausius described it with the German compound Wärmemenge, translated as "amount of heat".