Molecular MeanFree Path Length versus Pressure

Pressure (Torr)				Molecular Data
	MeanFree Path Length	OR	Molecules per cm3	Number of Molecules	Average Rate of Intermolecular Collision	OR
Atmosphere	1.0 x 10-5 cm	---	2.5 x 10+19	3.0 x 10+23	5.0 x 10+09/sec	---
1.0 x 10-3	7.0 x 1000 cm	---	3.3 x 10+13	3.5 x 10+17	6.5 x 10+03/sec	---
1.0 x 10-8	7.0 x 1000 km	4.38 miles	3.3 x 10+08	3.5 x 10+12	6.5 x 10-02/sec	1 per 15 sec
1.0 x 10-10	7.0 x 10+02 km	438 miles	3.3 x 10+06	3.5 x 10+10	6.5 x 10-04/sec	1 per 25 sec
1.0 x 10-12	7.0 x 10+04 km	438,000 miles	3.3 x 10+04	3.3 x 10+08	6.5 x 10-06/sec	1 per 45 hrs
1.0 x 10-14	7.0 x 10+06 km	4.38 x 10+06 miles	3.3 x 10+02	3.3 x 10+06	6.5 x 10-08/sec	1 per 88 days
1.0 x 10-16	7.0 x 10+08 km	4.38 x 10+08 miles	3.3 x 10+00	3.3 x 10+04	6.5 x 10-10/sec	1 per 51.5 yrs