Julius von Mayer,German physicist

Numéro d’image : 11689062
Julius von Mayer,German physicist
Julius von Mayer (1814-1878). 19th Century engraving of the German physicist and physician Julius Robert von Mayer. Mayer was a pioneer of the theory of the conservation of energy. He noted that blood retained more oxygen in hot weather and deduced that this was because the body required less oxygen to maintain body heat,and concluded that there was a fixed relationship be-tween heat and work. He studied the specific heat of gases,& argued that a gas cools as it expands because the heat is used up in expanding against atmospheric pressure. He later applied his theory of the conservation of energy more widely. From Weltall und Menscheit (Universe and Humanity),by Hans Kraemer (ca. 1880)
Licence : Droits gérés
Crédit: Science Photo Library / CCI Archives
Taille de l’image : 2797 px × 3201 px
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