COMMON MOLECULAR DIAMETERS

In chemical and materials science, understanding the molecular diameters of different gases is essential for designing molecular sieves, adsorbents, and optimizing gas separation processes.

Below are some common molecular diameter data for chemical materials, all in nanometers (nm).

These data are based on published scientific literature and estimates, and are intended to serve as a reference for technicians in related industries.

The following are the molecular diameters of common / rare gases and chemical raw materials：

1.Rare Gases：

He (Helium): 0.26 nm

Ar (Argon): 0.34 nm

Xe (Xenon): 0.396 nm

2.Light hydrocarbons and hydrocarbon derivatives：

H2 (hydrogen): 0.289 nm

CH4 (methane): 0.38 nm

C2H4 (ethylene): 0.39 nm

C2H6 (ethane): 0.40 nm

C3H8 (propane): 0.43 nm

C2H2Cl2 (dichloroethylene): approx. 0.45-0.50 nm

3.Inorganic gases

NO (nitric oxide): 0.317 nm

CO2 (carbon dioxide): 0.33 nm

CO (carbon monoxide): 0.376 nm

CL2 (chlorine): 0.44 nm

4.Other important gases/chemicals:

O2 (oxygen): 0.346 nm

N2 (Nitrogen): 0.364 nm

NH3 (ammonia): 0.444 nm

HCHO (formaldehyde): 0.45 nm

C3H6O (acetone): 0.47 nm

5.Halogens and other industrial gases:

F2 (fluorine gas): approx. 0.45 nm

Br2 (bromine gas): approx. 0.48 nm

SO2 (sulfur dioxide): approx. 0.41 nm

H2S (hydrogen sulfide): approx. 0.372 nm

H2O (water vapor, exists as a gas at room temperature and pressure): approx. 0.275 nm

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