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in this video weamp;#39;re going to talk about how to calculate the mean free path of a gas molecule so what is the definition of the mean free path the mean free path represented by the symbol lambda is the average distance that a gas molecule travels between collisions so weamp;#39;re dealing with neon in our example so how far will neon travel before it collides with another neon gas molecule thatamp;#39;s the mean free path and thatamp;#39;s what we need to calculate in this problem so what is the formula that can help us to get it the mean free path is equal to boltzmannamp;#39;s constant multiplied by the temperature divided by 4 pi times the square root of 2 times r squared times p so p is the pressure and r is the radius of the atom so weamp;#39;re given the atomic radius of neon itamp;#39;s 70 picometers now the value of boltzmannamp;#39;s constant is 1.38 times 10 to the negative 23. if you ever forget this number you can calculate it by taking r and dividing it by an