Example image of eyePlorer eyePlorer map for 'Mechanical equivalent of heat': Concept Conservation of energy History of science Thermodynamics Heat Motion (physics) Work (thermodynamics) James Prescott Joule Julius Robert von Mayer Ludwig A. Colding Nicolas Clément Sadi Carnot Calorie Fahrenheit Foot-pound (energy) Joule Pound (mass) Temperature Water Celsius Gram Specific heat capacity Caloric theory Denmark Hermann von Helmholtz British Science Association Oxford William Thomson, 1st Baron Kelvin England Kinetic theory France French Academy of Sciences Comptes rendus de l'Académie des sciences James Clerk Maxwell James Thomson Peter Guthrie Tait William John Macquorn Rankine 1850 May 18 Suicide John Tyndall Popular science Royal Institution Philosophical Magazine Edinburgh Review Henry Enfield Roscoe Léon Foucault Dictionary of National Biography Units of energy Gustave-Adolphe Hirn