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Table 1 Physical properties of helium, nitrogen, oxygen and air at 20°c and 765 mmHg atmospheric pressure

From: Clinical review: Use of helium-oxygen in critically ill patients

 

Density (ρ; g/l)

Viscosity (μ; micropoises)

Thermal conductivity (K; μcal/s/°K)

Helium

0.1785

188.7

352

Oxygen

1.251

167.4

58

Nitrogen

1.429

192.6

58.5

Air

1.293

170.8

58