In statistical mehcanics(pathria, 3rd edition), I have some questions for ideal fermi and bose gases. The textbook handles the approximation for z(=e^βµ) and nλ^3 (n=N/V, λ : thermal de Broglie wavelength). It considers the cases that z<<1, z~1, nλ^3~1,<<1,→0 and so on. In here, I am confused that these approximation for z and nλ^3 are correlated with ecah other or not?? In some approximation , FD(or BE) function is almost equal to z and z is equal to nλ^3! I am really confused. So could you explain that for me??(adsbygoogle = window.adsbygoogle || []).push({});

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# A Fermi and Bose gas in statistical mechanics

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