Wall-impact speed distribution
= Wall-impact speed distribution
The <speed distribution> of atoms striking a wall is weighted by the normal component of <velocity>, relative to the distribution of atoms present in the bulk. For an isotropic classical monatomic gas, the impact speed density is proportional to $v^3e^{-mv^2/(2k_BT)}$, and the mean impact <kinetic energy> is $2k_BT$, rather than $3k_BT/2$.