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'''Laws of Thermodynamics''' | ='''Laws of Thermodynamics'''= | ||
The laws of thermodynamics describe the specifics for the transport of heat and work in thermodynamic processes. Since their conception these laws have become some of the most important in all of physics and other branches of science connected to thermodynamics. They are often associated with concepts far beyond what is directly stated in the wording. | The laws of thermodynamics describe the specifics for the transport of [[heat]] and work in thermodynamic processes. Since their conception these laws have become some of the most important in all of physics and other branches of science connected to thermodynamics. They are often associated with concepts far beyond what is directly stated in the wording. | ||
'''First Law of Thermodynamics''' | =='''First Law of Thermodynamics'''== | ||
The definition of the first law of thermodynamics is the conversion of energy in a thermodynamic system; the total energy of a system can be increased by doing work on it or by adding heat. The equation is W+Q=the change in (KE+PE+TE) | The definition of the '''first law of thermodynamics''' is the conversion of [[energy]] in a thermodynamic system; the total energy of a system can be increased by doing work on it or by adding heat. The equation is: | ||
W+Q=the change in (KE+PE+TE). | |||
''' | '''Heat''' is the energy transferred as a result of a temperature difference between two objects. | ||
The second law of thermodynamics states that for any spontaneous process, the entropy of an isolated system can only increase or stay the same, but never decrease. Entropy is used to measure the disorder of a system. Heat can flow spontaneously, by itself, only from a hot source to a cold sink. No heat engine can be constructed in which heat from a hot source is converted entirely to work. The equation is | =='''Second Law of Thermodynamics'''== | ||
Efficiency = (heat in - heat out/ heat in) x 100% = (1- heat out/heat in) x 100% | |||
The '''second law of thermodynamics''' states that for any spontaneous process, the entropy of an isolated system can only increase or stay the same, but never decrease. [[Entropy]] is used to measure the disorder of a system. Heat can flow spontaneously, by itself, only from a hot source to a cold sink. No heat engine can be constructed in which heat from a hot source is converted entirely to work. The equation is | |||
Efficiency = (heat in - heat out/ heat in) x 100% = (1- heat out/heat in) x 100% | |||
[[Category:PH261]] | |||
[[Category:Energy]] | |||
Revision as of 23:58, 17 October 2007
Laws of Thermodynamics
The laws of thermodynamics describe the specifics for the transport of heat and work in thermodynamic processes. Since their conception these laws have become some of the most important in all of physics and other branches of science connected to thermodynamics. They are often associated with concepts far beyond what is directly stated in the wording.
First Law of Thermodynamics
The definition of the first law of thermodynamics is the conversion of energy in a thermodynamic system; the total energy of a system can be increased by doing work on it or by adding heat. The equation is:
W+Q=the change in (KE+PE+TE).
Heat is the energy transferred as a result of a temperature difference between two objects.
Second Law of Thermodynamics
The second law of thermodynamics states that for any spontaneous process, the entropy of an isolated system can only increase or stay the same, but never decrease. Entropy is used to measure the disorder of a system. Heat can flow spontaneously, by itself, only from a hot source to a cold sink. No heat engine can be constructed in which heat from a hot source is converted entirely to work. The equation is
Efficiency = (heat in - heat out/ heat in) x 100% = (1- heat out/heat in) x 100%