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Unformatted text preview: and protons Thermal energy reflects the kinetic energy of the molecules of a substance. Energy Units The SI unit for energy is the joule ("J"). In honor of James Prescot Joule (1818-1889) a British Scientist who investigated work and heat. (Note: SI is short for the French term Systeme International d'Unites . Which defines metric standards). Kinetic energy for example is defined as: Thus, the joule must have units of: kg*(meters/second) 2 and, in fact, 1 joule is defined as: Traditionally, energy changes accompanying chemical reactions have been expressed in calories , which is a non-SI unit (though still widely used). 1 calorie = 4.184 J...
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- Fall '10