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### Internal energy as a state function

Posted: Sat Jan 27, 2018 9:32 am
How can internal energy be a state function if work (a component of it) is not?

### Re: Internal energy as a state function

Posted: Sat Jan 27, 2018 10:13 am
both components that add up to the change in internal energy are path-dependent, but deltaU is not dependent. Most energy values are state functions, because they can conceptually be thought of as a position. Just like you can have a displacement in your position, the current energy state can be displaced to a different value and irrespective of the "how it was changed", it changed by a certain amount.

### Re: Internal energy as a state function

Posted: Sat Jan 27, 2018 1:08 pm
Internal energy is a state function because it depends only on the initial and final states of the internal energy.

Although work is not a state function, as long as the sum of work done and heat transferred is the same, the change in internal energy will be the same regardless of the pathway taken to get to the final state.

### Re: Internal energy as a state function

Posted: Sun Jan 28, 2018 3:01 pm
Internal energy (U) us a state property because changes in internal energy are a function of initial and final states. It doesn't depend on the path taken, it just depends on the initial and final state. (delta U = Ufinal - Uinitial)