Hi, your videos are perfect. I want to ask a question, the delta U =3/2 nR (delta) T equation is valid for which kind of conditions, I mean is it also right for just the monoatomic molecules or not? this is the first time I've seen this kind of equation; my professor did not mention this equation.
You're right, that equation is true only for monatomic ideal gases. We derived it in an earlier lecture: ua-cam.com/video/sI6I3JZ4tP4/v-deo.html . The 3D particle-in-a-box model that was used to derive it has the properties of a monatomic ideal gas.
you make reference to pv work. Does a gas system do any other form of work? U mentioning that w=0 in the isochoric process, makes it see like only pv work exist. is this conjecture correct?
It's possible for a system -- including a gas -- to do other kinds of work. For example, if you drop a balloon containing a gas, and it falls, it can do gravitational work. With considerably more effort, we could arrange for a gas do electrical work, etc. However, usually we are using a gas specifically to illustrate ideas associated with PV work, and we intentionally ignore other types of work to keep things simple. So, even though I probably fail to say it most of the time, discussions of work in this section of the course should come with the caveat that we are ignoring any types of work other than PV work.
Hi, your videos are perfect. I want to ask a question, the delta U =3/2 nR (delta) T equation is valid for which kind of conditions, I mean is it also right for just the monoatomic molecules or not? this is the first time I've seen this kind of equation; my professor did not mention this equation.
You're right, that equation is true only for monatomic ideal gases.
We derived it in an earlier lecture: ua-cam.com/video/sI6I3JZ4tP4/v-deo.html . The 3D particle-in-a-box model that was used to derive it has the properties of a monatomic ideal gas.
you make reference to pv work.
Does a gas system do any other form of work?
U mentioning that w=0 in the isochoric process, makes it see like only pv work exist.
is this conjecture correct?
It's possible for a system -- including a gas -- to do other kinds of work. For example, if you drop a balloon containing a gas, and it falls, it can do gravitational work. With considerably more effort, we could arrange for a gas do electrical work, etc.
However, usually we are using a gas specifically to illustrate ideas associated with PV work, and we intentionally ignore other types of work to keep things simple. So, even though I probably fail to say it most of the time, discussions of work in this section of the course should come with the caveat that we are ignoring any types of work other than PV work.