Collisional Cross Section Calculator

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Posted by Dinesh on

Online chemistry calculator calculates collisional cross section (effective area) between two molecules.

The collisional cross section is defined as the area around a particle in which the center of another particle must be in order for a collision to occur and it is typically denoted as σ and measured in units of area.

Table of Cross-Sections for Common Gases
Molecule Cross-Section (nm2)
Ar 0.36
C2H4 0.64
C6H6 0.88
CH4 0.46
Cl2 0.93
CO2 0.52
H2 0.27
He 0.21
N2 0.43
Ne 0.24
O2 0.40
SO2 0.58

Collisional Cross Section Between Two Molecules Calculation

Formula:

(1.1) σ A B = π ( r A + r B ) 2

where,
A, B = Molecules
r = Radius
π = 3.141592653589793
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