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Energy - History | | Energy - History: Encyclopedia II - Energy - History | | In the past, energy was discussed in terms of easily observable effects it has on the properties of objects or changes in state of various systems. Basically, if something changed, some sort of energy was involved in that change. As it was realized that energy could be stored in objects, the concept of energy came to embrace the idea of the potential for change as well as change itself. Such effects (both potential and realized) come in many different forms; examples are the electrical energy stored in a battery, the chemical energy stored i ...
See also:Energy, Energy - Types of energy, Energy - Conservation of energy, Energy - Alternative uses of the term, Energy - Forms of Energy, Energy - Units, Energy - SI, Energy - Other units of energy, Energy - Transfer of energy, Energy - Work, Energy - Heat, Energy - Conservation of energy, Energy - Types of energy, Energy - Kinetic energy, Energy - Potential energy, Energy - Internal energy, Energy - History, Energy - Energy and Economy, Energy - Energy in natural sciences, Energy - Energy resources, Energy - Notes | | | Energy, Energy - Alternative uses of the term, Energy - Conservation of energy, Energy - Energy and Economy, Energy - Energy in natural sciences, Energy - Energy resources, Energy - Forms of Energy, Energy - Heat, Energy - History, Energy - Internal energy, Energy - Kinetic energy, Energy - Notes, Energy - Other units of energy, Energy - Potential energy, Energy - SI, Energy - Transfer of energy, Energy - Types of energy, Energy - Units, Energy - Work, Principles of energetics, List of energy topics | | |
| | | Energy: Encyclopedia II - Energy - History
Energy - History
In the past, energy was discussed in terms of easily observable effects it has on the properties of objects or changes in state of various systems. Basically, if something changed, some sort of energy was involved in that change. As it was realized that energy could be stored in objects, the concept of energy came to embrace the idea of the potential for change as well as change itself. Such effects (both potential and realized) come in many different forms; examples are the electrical energy stored in a battery, the chemical energy stored in a piece of food, the thermal energy of a water heater, or the kinetic energy of a moving train. To simply say energy is "change or the potential for change", however, misses many important examples of energy as it exists in the physical world.
The concept of energy and work are relatively new additions to the physicist’s toolbox. Neither Galileo nor Newton made any contributions to the theoretical model of energy, and it was not until the middle of the 19th century that these concepts were introduced.
The development of steam engines required engineers to develop concepts and formulas that would allow them to describe the mechanical and thermal efficiencies of their systems. Engineers such as Sadi Carnot and James Prescott Joule, mathematicians such as Émile Claperyon and Hermann von Helmholtz , and amateurs such as Julius Robert von Mayer all contributed to the notions that the ability to perform certain tasks, called work, was somehow related to the amount of energy in the system. The nature of energy was elusive, however, and it was argued for some years whether energy was a substance (the caloric) or merely a physical quantity, such as momentum.
William Thomson (Lord Kelvin) amalgamated all of these laws into his laws of thermodynamics, which aided in the rapid development of energetic descriptions of chemical processes by Rudolf Clausius, Josiah Willard Gibbs, Walther Nernst. In addition, this allowed Ludwig Boltzmann to describe entropy in mathematical terms, and to discuss, along with Jožef Stefan, the laws of radiant energy.
For further information, see the Timeline of thermodynamics.
Other related archives1.0×10−7 J, 1.60217653×10−19 J, 3.6×106 J , 4.1868 kJ, British thermal unit, Celsius, Chemical energy, Coulomb's law, Crisis, Development, E=mc², EU Energy Label, EU Intelligent Energy, Earth, Efficiency, Electrical energy, Embodied energy, Emergy, Energy balance, Energy conversion, Energy development, Energy policy, Energy quality, Enthalpy, Exergy, Future energy development, Galileo, Heat, Hermann von Helmholtz, Internal energy, James Prescott Joule, Josiah Willard Gibbs, Jožef Stefan, Julius Robert von Mayer, Kinetic energy, List, List of energy topics, Lord Kelvin, Ludwig Boltzmann, Management, Mechanical work, Newton, Noether's theorem, Nuclear energy, Policy, Potential Energy, Potential energy, Power (physics), Principles of energetics, Radiant energy, Renewable, Rudolf Clausius, SI, SI base units, Sadi Carnot, Solar radiation, Sound energy, Specific orbital energy, Storage, Taylor series, Thermal energy, Thermodynamic entropy, Thermodynamics, Timeline of thermodynamics, Transmission, US units, Walther Nernst, acceleration, action, acupuncture, atm, atoms, caloric, calorie, cgs, charge, chemical, chemical bonds, chemical energy, chemical explosion, chemical reaction, chemistry, closed system, cm, concept, conduction, conservation of energy, convection, dam, distance, dot product, effects of global warming, elastic energy, electric, electric energy, electrical, electrical energy, electricity, electromagnetic wave, electromagnetic waves, electrons, electronvolt, electrostatic, erg, food energy, foot-pound force, force, friction, g, gee, generator, gravitational attraction, gravitational force, gravity, healing, heat, height, horsepower, imperial, infinitesimal, integrated, internal combustion engine, joule, kilogram, kilowatt-hour, kinetic, kinetic energy, km/h, light, liter, mass, matter, mechanical, mechanical equivalent of heat, mechanical work, metre, molecules, momentum, motion, mystical, newton, nuclear, nuclear energy, nuclei, nucleons, object, off shell, particle physics, path integral, pendulum, perpetual motion, phase, physical system, physics, position, potential, potential energy, pressure, properties, quantity, radiant, radiant energy, radiation, reference, reiki, relativistic, renewable energy, rest mass, rotational, s, spectroscopy, speed of light, spiritual, state function, steam engines, steam power, system, temperature, thermal, thermal energy, thermodynamics, time, torque, translational symmetry, turbine, vacuum, velocity, vibrational, water, °C, Émile Claperyon
 Adapted from the Wikipedia article "History", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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