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Thermodynamics Concepts 
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#1
Mar2311, 09:52 PM

P: 13

Hi, I have a couple of questions for my general knowledge because I have a test coming up and I'm confused on some stuff
1) For an isothermal process is the [tex]\Delta[/tex]S=0 because [tex]\Delta[/tex]T=0? since it equals zero does that mean that the process is irreversible? 2)What makes a process reversible? is that when the [tex]\Delta[/tex]S>0? 3)In an adiabatic process, pV^{[tex]\gamma[/tex]}=const. means that it equals a constant value not it is constant because if the temperature changes then the pressure and volume or one of them has to change right? But I dont understand how that is constant when Q=0, but then when [tex]\Delta[/tex]T=0, just PV is constant, wouldn't what I had earlier be constant at [tex]\Delta[/tex]T=0 too? 4) In an adiabatic process when I use p_{i}V_{i}^{[tex]\gamma[/tex]}=p_{f}V_{f}[tex]\gamma[/tex], means that I can just find the final pressure or the volume after the process occurs? 5)Similarly what does this mean? T_{H}V_{i}^{[tex]\gamma[/tex]1}=T_{L}V_{f}^{[tex]\gamma[/tex]1} and if I was only given the heat transfer Q_{H} and Q_{L} could I substitute that in for T_{H} and T_{L}? 6)In an Isochoric process, the volume is constant, so to find Q or [tex]\Delta[/tex]U, I can use either =nC_{v}[tex]\Delta[/tex]T or =3/2nR[tex]\Delta[/tex]T? 7)In an Isobaric process, constant pressure, does [tex]\Delta[/tex]U=Q? Is this correct Q=mc[tex]\Delta[/tex]T or [tex]\Delta[/tex]U=nC_{v}[tex]\Delta[/tex]T? or do I use something with C_{p} like [tex]\Delta[/tex]U=nC_{p}[tex]\Delta[/tex]T? 


#2
Mar2311, 11:49 PM

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#3
Mar2411, 09:23 AM

P: 13

thanks that cleared up a lot!



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