Talk:First Law of Thermodynamics

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The differentials for heat and work need to be changed to inexact differentials

Explain the differentials. 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 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 need to be changed to
Yesterday you changed the first paragraph of the article to something that wasn't true. Is what you've written here true? Karajou (talk) 13:38, 20 November 2016 (EST)