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Talk:First Law of Thermodynamics (view source)
Revision as of 17:50, November 20, 2016
, 17:50, November 20, 2016no edit summary
The differentials for heat and work need to be changed to inexact differentials
The differentials for heat and work need to be changed to inexact differentials
:Explain the differentials. [[User:Karajou|Karajou]] ([[User talk:Karajou|talk]]) 12:28, 20 November 2016 (EST)
:Explain the differentials. [[User:Karajou|Karajou]] ([[User talk:Karajou|talk]]) 12:28, 20 November 2016 (EST)
::The internal energy is an exact differential as internal energy is a function of state. That is to say that how it changes is independent of the path taken between two states.
::Heat and work are inexact differentials as they do depend on the paths taken.
::Consider this diagram [[click here|http://www.antonine-education.co.uk/Image_library/Physics_5_Options/Applied_Physics/App_04/Cycle_1.gif]]
::The work done on the gas is proportional the area under the path taken. You can see that going from b to c directly more work is done that if we go from b to a to d to c.
::Basically, for heat and work, the <math>\,d</math> need to be changed to <math>\delta</math>