Zeroth law of thermodynamics - Revision history

wikademia>Wikademia at 18:27, 11 April 2009

2009-04-11T18:27:06Z

← Older revision		Revision as of 18:27, 11 April 2009
Line 16:		Line 16:

	[[Category:Materials science]]		[[Category:Materials science]]
			{{ntnes}}

wikademia>Wikademia at 07:09, 6 April 2009

2009-04-06T07:09:45Z

← Older revision		Revision as of 07:09, 6 April 2009
Line 15:		Line 15:
	The surface <math>PV / N = \mbox{const}</math> defines surfaces of equal temperature, and the obvious (but not only) way to label them is to define T so that <math>PV / N = RT</math> where R is some constant. These systems can now be used as a thermometer to calibrate other systems.		The surface <math>PV / N = \mbox{const}</math> defines surfaces of equal temperature, and the obvious (but not only) way to label them is to define T so that <math>PV / N = RT</math> where R is some constant. These systems can now be used as a thermometer to calibrate other systems.

	~~[[fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique]]~~
	[[Category:Materials science]]		[[Category:Materials science]]

wikademia>Wikademia: moved Materials Science and Engineering/List of Topics/Thermodynamics/Zeroth Law of Thermodynamics to Zeroth law of thermodynamics

2009-04-06T07:09:27Z

moved Materials Science and Engineering/List of Topics/Thermodynamics/Zeroth Law of Thermodynamics to Zeroth law of thermodynamics

← Older revision	Revision as of 07:09, 6 April 2009
(No difference)

wikademia>Wikademia: 5 revisions

2009-04-06T07:09:10Z

5 revisions

← Older revision	Revision as of 07:09, 6 April 2009
(No difference)

wikademia>Dark Mage: +cat

2008-08-27T18:24:24Z

+cat

← Older revision		Revision as of 18:24, 27 August 2008
Line 16:		Line 16:

	[[fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique]]		[[fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique]]
			[[Category:Materials science]]

wikademia>Crochet.david.bot: robot Adding: fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique

2007-12-28T09:34:42Z

robot Adding: fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique

← Older revision		Revision as of 09:34, 28 December 2007
Line 14:		Line 14:

	The surface <math>PV / N = \mbox{const}</math> defines surfaces of equal temperature, and the obvious (but not only) way to label them is to define T so that <math>PV / N = RT</math> where R is some constant. These systems can now be used as a thermometer to calibrate other systems.		The surface <math>PV / N = \mbox{const}</math> defines surfaces of equal temperature, and the obvious (but not only) way to label them is to define T so that <math>PV / N = RT</math> where R is some constant. These systems can now be used as a thermometer to calibrate other systems.

			[[fr:Introduction à la thermodynamique/Principe zéro de la Thermodynamique]]

wikademia>Dgray at 05:34, 28 December 2007

2007-12-28T05:34:00Z

← Older revision		Revision as of 05:34, 28 December 2007
Line 4:		Line 4:

	In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.		In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.

			== Temperature and the zeroth law ==

	It is often claimed, for instance by Max Planck in his influential textbook on thermodynamics, that this law proves that we can define a temperature function, or more informally, that we can 'construct a thermometer'. Whether this is true is a subject in the philosophy of thermal and statistical physics.		It is often claimed, for instance by Max Planck in his influential textbook on thermodynamics, that this law proves that we can define a temperature function, or more informally, that we can 'construct a thermometer'. Whether this is true is a subject in the philosophy of thermal and statistical physics.

wikademia>Dgray at 05:33, 28 December 2007

2007-12-28T05:33:35Z

← Older revision		Revision as of 05:33, 28 December 2007
Line 1:		Line 1:
	The '''zeroth law of thermodynamics''' is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciation of the zeroth law of thermodynamics is:		The '''zeroth law of thermodynamics''' is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciation of the zeroth law of thermodynamics is:

	~~<div style=~~"~~font-size:125%">~~		"If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other."
	~~{{cquote\|~~If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other.~~}}</div>~~

	In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.		In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.

			It is often claimed, for instance by Max Planck in his influential textbook on thermodynamics, that this law proves that we can define a temperature function, or more informally, that we can 'construct a thermometer'. Whether this is true is a subject in the philosophy of thermal and statistical physics.

			In the space of thermodynamic parameters, zones of constant temperature will form a surface, which provides a natural order of nearby surfaces. It is then simple to construct a global temperature function that provides a continuous ordering of states. Note that the dimensionality of a surface of constant temperature is one less than the number of thermodynamic parameters (thus, for an ideal gas described with 3 thermodynamic parameter P, V and n, they are 2D surfaces). The temperature so defined may indeed not look like the Celsius temperature scale, but it is a temperature function.

			For example, if two systems of ideal gas are in equilibrium, then <math>P1V1/N1 = P2V2/N2</math> where <math>P_i</math> is the pressure in the ''ith'' system, <math>V_i</math> is the volume, and <math>N_i</math> is the 'amount' (in moles, or simply number of atoms) of gas.

			The surface <math>PV / N = \mbox{const}</math> defines surfaces of equal temperature, and the obvious (but not only) way to label them is to define T so that <math>PV / N = RT</math> where R is some constant. These systems can now be used as a thermometer to calibrate other systems.

wikademia>Dgray: New page: The '''zeroth law of thermodynamics''' is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciatio...

2007-12-28T05:30:41Z

New page: The '''zeroth law of thermodynamics''' is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciatio...

New page

The '''zeroth law of thermodynamics''' is a generalized statement about bodies in contact at thermal equilibrium and is the basis for the concept of temperature. The most common enunciation of the zeroth law of thermodynamics is:

<div style="font-size:125%">
{{cquote|If two thermodynamic systems are in thermal equilibrium with a third, they are also in thermal equilibrium with each other.}}</div>

In other words, the zeroth law says that if considered a mathematical binary relation, thermal equilibrium is transitive.