Page 1 of 1

### Integral Expression for Work

Posted: Wed Feb 06, 2019 5:24 pm
Will we ever need to use the integral equation or do we just need to understand it and be able to apply the variations of it?

### Re: Integral Expression for Work

Posted: Wed Feb 06, 2019 5:56 pm
The integral equation applies to reversible work, where P is not a constant. Use it if stated to be reversible. Use w=-PdeltaV if it's irreversible.

### Re: Integral Expression for Work

Posted: Wed Feb 06, 2019 9:37 pm
You only need to know it to understand the derivation of the 2nd law of thermodynamics. The actual equations used do not include the integral.

### Re: Integral Expression for Work

Posted: Wed Feb 06, 2019 9:43 pm
My TA said that the only equations we will have to use for work are w=-PΔV (for a system with constant pressure) and w=-nRT(ln(V2/V1)) (for a reaction that is isothermal reversible). The integral is more for understanding than actual needing to use the equation to solve it for this class (I think)

### Re: Integral Expression for Work

Posted: Thu Feb 07, 2019 10:59 pm
I think we just need to know how to apply it. The integral was used to help explain how the formula w=-PdeltaV was derived.