First law of thermodynamics - Revision history

Jmdonev: 1 revision imported: Doing upload, largely of old redirects.

2018-06-04T16:52:20Z

1 revision imported: Doing upload, largely of old redirects.

← Older revision	Revision as of 16:52, 4 June 2018
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Jmdonev at 22:52, 31 May 2018

2018-05-31T22:52:43Z

← Older revision		Revision as of 22:52, 31 May 2018
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	[[Category:Done ~~2017~~-07-01]]		[[Category:Done 2018-06-01]]
	~~[[Category:Needs citations]]~~
	<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (<math>\Delta U</math>) is equal to the [[work]] done by or to the [[system]] (<math>W</math>) and the [[heat]] that flows in or out of it (<math>Q</math>).</onlyinclude>		<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (<math>\Delta U</math>) is equal to the [[work]] done by or to the [[system]] (<math>W</math>) and the [[heat]] that flows in or out of it (<math>Q</math>).</onlyinclude>

	The equation for this relationship is:		The equation for this relationship is:
	<math>\Delta U = W + Q</math>		<math>\Delta U = W + Q</math><ref name= knight>R. Knight, Physics for scientists and engineers. Boston, Mass.: Addison-Wesley, 2012, p. 478.</ref>

	This means that if [[energy]] is input to a system by doing work <math>W</math> on it, then it will get hotter. If the system is to stay the same [[temperature]], then you must remove heat from the system - <math>Q</math>.		This means that if [[energy]] is input to a system by doing work <math>W</math> on it, then it will get hotter. If the system is to stay the same [[temperature]], then you must remove heat from the system - <math>Q</math>.

	The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.		The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.<ref name= knight/>

	This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go ~~somewhere - the~~ basis for [[cogeneration]]. As an [[engine]] creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% [[efficiency]] (see [[carnot efficiency]]), heat must be vented. This can either be treated as [[waste heat]], or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.		This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere—the basis for [[cogeneration]]. As an [[engine]] creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% [[efficiency]] (see [[carnot efficiency]]), heat must be vented. This can either be treated as [[waste heat]], or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.

	To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].		To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].

			==For Further Reading==
			*[[Law of conservation of energy]]
			*[[Internal energy]]
			*[[Work]]
			*[[Heat]]
			*[[Carnot efficiency]]
			*Or explore a [[Special:Random\| random page]]

			==References==
			{{reflist}}

	[[Category:Uploaded]]		[[Category:Uploaded]]

Jmdonev: 1 revision imported

2017-08-29T01:47:18Z

1 revision imported

← Older revision	Revision as of 01:47, 29 August 2017
(No difference)

Jmdonev at 22:39, 16 August 2017

2017-08-16T22:39:40Z

← Older revision		Revision as of 22:39, 16 August 2017
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	[[Category: Done ~~2015~~-09-06]]		[[Category:Done 2017-07-01]]
	[[Category:Needs citations]]		[[Category:Needs citations]]
	<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (~~Δ''~~U'') is equal to the [[work]] done by or to the [[system]] (''W'') and the [[heat]] that flows in or out of it (''Q'').</onlyinclude>		<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (<math>\Delta U</math>) is equal to the [[work]] done by or to the [[system]] (<math>W</math>) and the [[heat]] that flows in or out of it (<math>Q</math>).</onlyinclude>

	The equation for this relationship is:		The equation for this relationship is:
	~~Δ''~~U'' = ''W'' + ''Q''		<math>\Delta U = W + Q</math>

	This means that if [[energy]] is input to a system by doing work <m>W</m> on it, then it will get hotter. If the system is to stay the same [[temperature]], then you must remove heat from the system - <m>Q</m>.		This means that if [[energy]] is input to a system by doing work <math>W</math> on it, then it will get hotter. If the system is to stay the same [[temperature]], then you must remove heat from the system - <math>Q</math>.

	The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.		The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.

	This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere - the basis for [[cogeneration]]. As an engine creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% [[efficiency]] (see [[carnot efficiency]]), heat must be vented. This can either be treated as [[waste heat]], or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.		This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere - the basis for [[cogeneration]]. As an [[engine]] creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% [[efficiency]] (see [[carnot efficiency]]), heat must be vented. This can either be treated as [[waste heat]], or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.

	To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].		To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-09-18T16:51:04Z

1 revision imported

← Older revision	Revision as of 16:51, 18 September 2015
(No difference)

Kjstenho at 20:08, 3 September 2015

2015-09-03T20:08:15Z

← Older revision		Revision as of 20:08, 3 September 2015
Line 1:		Line 1:
	[[Category:Done 2015-02-15]]		[[Category: Done 2015-09-06]]
	[[Category:Needs citations]]		[[Category:Needs citations]]
	<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (Δ''U'') is equal to the [[work]] done by or to the [[system]] (''W'') and the [[heat]] that flows in or out of it (''Q'').</onlyinclude>		<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (Δ''U'') is equal to the [[work]] done by or to the [[system]] (''W'') and the [[heat]] that flows in or out of it (''Q'').</onlyinclude>
Line 6:		Line 6:
	Δ''U'' = ''W'' + ''Q''		Δ''U'' = ''W'' + ''Q''

	This means that if energy is input to a system by doing work <m>W</m> on it, then it will get hotter. If the system is to stay the same temperature, then you must remove heat from the system - <m>Q</m>.		This means that if [[energy]] is input to a system by doing work <m>W</m> on it, then it will get hotter. If the system is to stay the same [[temperature]], then you must remove heat from the system - <m>Q</m>.

	The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.		The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.

	This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere - the basis for [[cogeneration]]. As an engine creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% efficiency (see [[carnot efficiency]]), heat must be vented. This can either be treated as waste heat, or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.		This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere - the basis for [[cogeneration]]. As an engine creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% [[efficiency]] (see [[carnot efficiency]]), heat must be vented. This can either be treated as [[waste heat]], or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.

	To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].		To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-08-26T21:31:05Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
(No difference)

J.williams at 16:54, 12 August 2015

2015-08-12T16:54:21Z

New page

[[Category:Done 2015-02-15]]
[[Category:Needs citations]]
<onlyinclude>The '''first law of thermodynamics''' states that the change in [[internal energy]] of a system (Δ''U'') is equal to the [[work]] done by or to the [[system]] (''W'') and the [[heat]] that flows in or out of it (''Q'').</onlyinclude>

The equation for this relationship is:
Δ''U'' = ''W'' + ''Q''

This means that if energy is input to a system by doing work <m>W</m> on it, then it will get hotter. If the system is to stay the same temperature, then you must remove heat from the system - <m>Q</m>.

The first law of [[thermodynamics]] is a generalization of the [[law of conservation of energy]], which states that energy can neither be created nor destroyed.

This is a particularly important law when discussing [[heat engine]]s (like car engines), because it helps to understand that heat must go somewhere - the basis for [[cogeneration]]. As an engine creates [[heat]], if the heat is not vented, the engine will become hotter and hotter, which will eventually lead to melting. Therefore, because it is impossible to achieve 100% efficiency (see [[carnot efficiency]]), heat must be vented. This can either be treated as waste heat, or used for [[cogeneration]], which is applying the waste heat to another cause, like heating a car, or heating houses.

To learn more about the first law of thermodynamics, please check out [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/firlaw.html#c1 hyperphysics].
[[Category:Uploaded]]