Energy
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| [[Image:The Great Wave off Kanagawa by Hokusai.jpg|thumb|left|200px|''[[The Great Wave off Kanagawa]]'' (between [[1823]]-[[1829|29]], [[woodblock printing in Japan|woodblock printing]] by [[Hokusai]]]] | [[Image:The Great Wave off Kanagawa by Hokusai.jpg|thumb|left|200px|''[[The Great Wave off Kanagawa]]'' (between [[1823]]-[[1829|29]], [[woodblock printing in Japan|woodblock printing]] by [[Hokusai]]]] | ||
| [[Image:Explosion.jpg|thumb|right|200px|Citation: "[[energy]] destroys us; it is we who pay the price of the [[inevitable]] [[explosion]]" --''[[The Accursed Share]]'', cited in ''[[Logics of Failed Revolt: French Theory After May '68]]'' by [[Peter Starr]]]] | [[Image:Explosion.jpg|thumb|right|200px|Citation: "[[energy]] destroys us; it is we who pay the price of the [[inevitable]] [[explosion]]" --''[[The Accursed Share]]'', cited in ''[[Logics of Failed Revolt: French Theory After May '68]]'' by [[Peter Starr]]]] | ||
| + | [[Image:Splendor Solis.jpg|thumb|right|200px|[[Splendor Solis]] ([[1532]]-[[1535]]) - [[Salomon Trismosin]]]] | ||
| {{Template}} | {{Template}} | ||
| - | :''[[energy (esotericism)]]'' | ||
| In [[physics]], '''energy''' is an indirectly observed quantity that is often understood as the ability of a [[physical system]] to do [[Work (physics)|work]] on other physical systems. However, this must be understood as an overly simplified definition, as the laws of [[thermodynamics]] demonstrate that not all energy can perform work. Depending on the boundaries of the physical system in question, energy as understood in the above definition may sometimes be better described by concepts such as [[exergy]], [[emergy]] and [[thermodynamic free energy]]. Therefore, in the words of [[Richard Feynman]], ''"It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount."'' However, it is clear that energy is always an indispensable prerequisite for performing work, and the concept has great importance in [[natural science]]. | In [[physics]], '''energy''' is an indirectly observed quantity that is often understood as the ability of a [[physical system]] to do [[Work (physics)|work]] on other physical systems. However, this must be understood as an overly simplified definition, as the laws of [[thermodynamics]] demonstrate that not all energy can perform work. Depending on the boundaries of the physical system in question, energy as understood in the above definition may sometimes be better described by concepts such as [[exergy]], [[emergy]] and [[thermodynamic free energy]]. Therefore, in the words of [[Richard Feynman]], ''"It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount."'' However, it is clear that energy is always an indispensable prerequisite for performing work, and the concept has great importance in [[natural science]]. | ||
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| *[[Index of wave articles]] | *[[Index of wave articles]] | ||
| *[[Combustion]] | *[[Combustion]] | ||
| + | *[[Energy (esotericism)]] | ||
| {{GFDL}} | {{GFDL}} | ||
Revision as of 10:47, 28 April 2014
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In physics, energy is an indirectly observed quantity that is often understood as the ability of a physical system to do work on other physical systems. However, this must be understood as an overly simplified definition, as the laws of thermodynamics demonstrate that not all energy can perform work. Depending on the boundaries of the physical system in question, energy as understood in the above definition may sometimes be better described by concepts such as exergy, emergy and thermodynamic free energy. Therefore, in the words of Richard Feynman, "It is important to realize that in physics today, we have no knowledge what energy is. We do not have a picture that energy comes in little blobs of a definite amount." However, it is clear that energy is always an indispensable prerequisite for performing work, and the concept has great importance in natural science.
Energy is necessary for things to change. All living things require available energy to stay alive; humans get such energy from food, along with the oxygen needed to metabolize the food. Human civilization requires a continual supply of energy to function, energy resources such as fossil fuels are a vital topic in economics and politics. Earth's climate and ecosystem are driven by the radiant energy Earth receives from the sun, and are delicately sensitive to changes in the amount received.
See also
