internal energy state function


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Franca Park 3J
Posts: 64
Joined: Fri Sep 25, 2015 3:00 am

internal energy state function

Postby Franca Park 3J » Thu Jan 28, 2016 10:21 pm

How does it make sense that internal energy is a state function when it is made up of heat and work which are both not state functions?

Sandeep Gurram 2E
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

Re: internal energy state function

Postby Sandeep Gurram 2E » Thu Jan 28, 2016 10:48 pm

Internal energy is a state function because it doesn't matter how one got to the final state of a certain system. A system could do 100 J of work and end up at a particular internal energy. Another system could do 100,000 J of work and arrive at the same internal energy. Regardless of how much work or heat was released/absorbed, both systems have arrived to the same final internal energy state and therefore the change in internal energy is the same (assuming they started at the same internal energy levels).

Hope that helped!


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