From the gas kinetic theory, for a 1 atmosphere pressure and at 300K, and for a surface of 1 cm2 there are 2.9 1023 collisions of molecules every second.

(Garbor, A. Somorjai: Introduction to Surface Chemistry and Catalysis, Wiley, New York 1994, French version: Chimie des surfaces et catalyse Trad. Marie-Paul Delplancke, Ediscience, Paris 1995).

Let's imagine a 28 cm size cubic volume (22.4 liters) and somewhere onto one side, a small 10x10Å catalyst surface of 100Å2.

This will result to a number of 2,9 109 collisions/second for this small surface.



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