Coefficients of molecular diffusivity
Recommended
coefficients of diffusivity (cm2 / s) of selected gases
in air, N2, and O2. Only D (0,1) is
given, D(T,p) = D(0,1)(p0/p)(T/T0)1.81
is assumed.
| Gas |
Air |
N2 |
O2 |
| H2O |
0.2178 |
0.2178 |
0.2178 |
| CO2 |
0.1381 |
0.1429 |
0.1402 |
| CH4 |
0.1952 |
0.1892 |
0.1942 |
| CO* |
0.1807** |
0.1804 |
0.1817 |
| SO2 |
0.1119S |
0.1089 |
0.1089 |
| O3 |
0.1444 |
0.1441 |
0.1454 |
| NH3 |
0.1978 |
0.1978 |
0.1992 |
| N2O |
0.1436 |
0.1402 |
0.1396 |
| NO |
0.1802 |
0.1809 |
0.1815 |
| NO2 |
0.1361 |
0.1359 |
0.1369 |
| N2* |
0.1788** |
0.1783 |
0.1809 |
| O2 |
0.1820** |
0.1809 |
0.1862 |
| Hg
vapor |
0.1194 |
0.1211 |
0.1227 |
| O |
0.2773 |
0.2773 |
0.2773 |
| OH |
0.2543 |
0.2527 |
0.2604 |
| H2SO4 |
0.0752 |
0.0762 |
0.0717 |
| HNO3 |
0.1041 |
0.1075 |
0.1041 |
| HNO2
(HONO) |
0.1349 |
0.1354 |
0.1331 |
| H2O2 |
0.1300 |
0.1300 |
0.1300 |
| NO3 |
0.1153 |
0.1160 |
0.1125 |
| N2O5 |
0.0808 |
0.0816 |
0.0777 |
*Isometric
molecules
** From Blanc's law and D(0,1) for
gas in N2 and in O2
S - recalculated with new data
Recommended
Thermal Diffusivity and kinematic viscosity (cm2/s)
of air (cm2/s). Only k(0, 1) and v(0, 1) are given by
k(T, p) = k(0, 1)(p0/p)(T/T0)1.81
and v(T,p)=v(0,1)(p0/p)(T/T0)1.81
are assumed k(0,
1) = 0.1869
and v(0,
1) = 0.1327.
Publications
for more details on these figures:
| A
review of the molecular diffusivities of H2O, CO2, CH4,
CO, O3, SO2, NH2, N2O, NO and NO2 in air, O2 and N2 near
STP. Atmospheric Environment, 32A 1111-1127. 1998.
Massman, WJ. |
| Molecular
diffusivities of Hg vapor in air, O2 and N2 near STP and
the kinematic viscosity and thermal diffusivity of air near
STP. Atmospheric Environment, 33, 453-457. 1999.
Massman, WJ. |
|
