Chemical Thermodynamics 3.7 - Adiabatic / Isothermal Comparison
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- Опубліковано 13 вер 2016
- Short physical chemistry lecture comparing reversible adiabatic and isothermal expansion and compression of ideal gases.
The heat, work, and change in internal energy, temperature, pressure, and volume are summarized for reversible expansion / compression of ideal gases when adiabatic and isothermal.
Notes Slide: i.imgur.com/0EmmaYj.png
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If your channel had worked through examples, this channel would be better than going to college! nonetheless, the videos are still super awesome!
Thanks, Will. There are some worked through examples, just not for all concepts. You'll typically see 1-2 videos per chapter which solve a sample problem.
I found the table very useful. I had a slight question though. Shouldn't you have left the sign conventions out of w and q in the isothermal column seeing as they're relative to the process that's taking place?
I suppose the value of the natural log is going to be the ultimate decider of the sign of each value.
Yes, the relative magnitude of Vf and Vi as well as the difference between Tf and Ti will ultimately determine the sign of the values in these tables. If Vf > Vi (expansion), Vf/Vi > 1, and ln(Vf/Vi) > 0. The reverse is true for compression. For adiabatic, if Vf > Vi, then Tf < Ti, Tf - Ti < 0, and deltaU < 0. It's good practice to think about the different cases that come up and what the equation predicts at the extremes of allowed input values.
Watching from INDIA
Nice video.. Do the adiabatic formulae assume reversibility, so that it would be synonymous with isentropic? If not, could you add a column for an isentropic process, and compare/contrast it to the adiabatic?
Watching from INDIA
Is adiabatic work not defined wrong?
it seems the title of this video is spelled wrong.
Oh boy. That was bad. Thankfully titles are easy to change. Thanks for catching the error!