일반물리학 1 — The Kinetic Theory of Gases: Problem 20

20 At 20°C and 750 torr pressure, the mean free paths for argon gas (Ar) and nitrogen gas ($N_2$) are $\lambda_{Ar} = 9.9 \times 10^{-6}$ cm and $\lambda_{N_2} = 27.5 \times 10^{-6}$ cm. (a) Find the ratio of the diameter of an Ar atom to that of an $N_2$ molecule. What is the mean free path of argon at (b) 20°C and 300 torr, and (c) -60°C and 750 torr?