I can't understand why the likelihood of a particle to be in state $\epsilon_i$ in a canonical ensemble, does not depend upon the number of particles in that state. The probability that the a single particle is in state $\epsilon_i$ is given by the gibbs/boltzmann probability $p_i=\frac{e^{-\beta...

Although air is light, it is fluid. So it must exert upthrust on people. So does it mean, in fact, we are heavier than our weight? Also, the gravitational acceleration is bigger than its value?

For a filament lamp than is operating normally such that the temperature is constant, the rate of change in internal energy of the system is zero. This would mean that rate of net heat transfer to the system + rate of work done on the system = 0 I can understand why rate of work done on the syste...

Let me confess that it's a homework problem. I was working on a heuristic proof of the following problem. How can we prove that the very early universe can be considered to be flat. It was asked in my postgraduate course and general theory of relativity is merely introduced. At, present I am str...