I have a question on my homework I can't really figure out. It's from Reif, problem 3.6, Fundamentals of Statistic and thermal physics
Question: A glass bulb contains air at room temperature and at a pressure of 1 atmosphere. It is placed in a chamber ﬁlled with helium gas at 1 atmosphere and at a room temperature. A few months later, the experimenter happens to read in a journal article that the particular glass of which the bulb is made is quite permeable to helium, although not to any other gases. Assuming that equilibrium has been attained by this time, what gas pressure will the experimenter measure inside the bulb when he goes back to check?
I'm pretty sure I have to assume the volume of the helium is much larger than the volume of the light bulb in order for this to work. I think in equilibrium the number of accessible states is minimized, so that's kind of what my initial thoughts were, but then I didn't know how to progress after that. Thanks for the help!