Abstract: The chemical potentials of Bose, Fermi and Van der Waals gases are obtained by the ensemble theory, and the adsorption rates of the three kinds of gases are compared with that of the idea gas. The adsorption rate of Fermi gas is larger than that of the idea gas, and that of Bose gas smaller than that of the latter. There is a critical temperature. When the temperature is higher than the critical temperature, the model of the idea gas describing the Fermi gas is better than that of the Van der Waals gas. When the temperature is lower than the critical temperature, the model of the idea gas describing the Bose gas is better than that of the Van der Waals gas.

Key words: Van der Waals gas, adsorption rate, critical temperature, Bose gas, Fermi gas