Question

the expression of mean free path,if consider that only one molecule is moving​

Answer 1

HEY MATE HERE IS THE ANSWER

Answer 2

$\huge\mathfrak{Answer:-}$

⭕️ The path travelled by a molecule between two successive collisions with other molecule is called Mean Free path.

⭕️ In other words we can say that the average distance between two consecutive collisions is defined as the mean Free path.

⭕️ For the derivation check out the given attachment!