Recent content by Greg777

Thanks for the answer. That question seemed wrong and absurd to me from the beginning - that's not cool that a supposedly reputable textbook (it's an Oxford one) makes such mistakes misguding naive high schoolers :)

Yes, I know that internal energy also depends on the mass of a body but is my "explanation" in the first post correct if we assume that we have two different bodies with the same mass at the same temperature?

Hello, From what I know, internal energy of a body = sum of kinetic energies of the particles of the body + potential energy between the particles (intermolecular forces), right? And there's this textbook question which made me question that for a while: Two objects are at the same temperature...

Homework Statement Hello, I have the following problem (an ABCD question): Two objects near each other are at the same temperature. Which of the following statements has to be true? A. The objects have the same internal energy. B. The objects have the same thermal capacity. C. No...

Under what circumstances the number may decrease? I understood that randomness don't matter but the most important concept I don't get is why the number of leaving/joining particles may increase but then stay constant? Why (even if in isolated container) all the particles won't turn into gas...

So the number of particles leaving and joining the surface increases up to the equilibrum and then stays constant?

Ok, so now I know that randomness doesn't really matter but I'm still confused about the equilibrum - I know that the same amount of particles leave and rejoin the surface but does this number of leaving/joining particles increase over time? So e.g. X particles leave and X particles return and...

For example the act of leaving the surface by the particle is determined by whether it has sufficient "excess" of kinetic energy. But whether the particle will leave the surface depends if it's close to the surface and I think that's completely random. And also rejoining the surface seems random...

Hello, I've read about the concept of saturated vapour pressure on some sites but none of them really explain why the equilibrum happens and that's what I want to ask you. Why the number of particles leaving the surface and joining the surface can't change over time and never reach the equilibrum?

Hello, I've read that the force F we use in the pressure formula P=F/A is an average of all microscopic forces exerted by the gas on the wall of the container over a period of time. Is it true? I thought it was a SUM rather than an average? I assume that in that definition the microscopic force...

Hello, I was learning about Avogadro's Law and trying to find some real-life example of it. It mainly states that: For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant. So let's say I have a balloon...