What is the mean free path of an N2 molecule in an ultra-high-vacuum chamber at a pressure of 10-10mbar?
number density n, collision cross-section σ
pressure p, temperature T
d molecular diameter
The Attempt at a Solution
where we know p and I can estimate d to be around 10-10m. However I am not given T, and I don't really see how I could know what it is...