Air
DESCRIPTION (Air):
Air is a mixture of Nitrogen, Oxygen,
Argon, Carbon Dioxide and minute quantities of rare gases. The concentrations of these
gases will vary according to the altitude at which the sample is collected. It is
typically shipped in steel cylinders at pressures between 2200 - 2400 psig @ 70° F. Common
uses are low temperature cooling and breathing air in life support systems.
PHYSICAL PROPERTIES (Air):
| Density @ 20° C., 1 atm.: |
|
1.205x10-3 g/ml |
| Specific Volume @ 60° F., 1 atm.: |
|
13.3 cu.ft/lb |
| Thermal Conductivity, Gas @ 0° C. : |
|
0.01169 BTU/hr ft2° F/ft |
| Critical Temperature: |
|
97.3° F |
| Critical Pressure: |
|
905.5 psia |
| Critical Density: |
|
0.231 g/ml |
| Viscosity, Gas @ 25° C., 1 atm. : |
|
0.00943 centipoise |
| Gas |
Mole % |
|
RARE GASES |
ppm by Volume |
| Nitrogen |
78.084 |
|
Neon |
18.18 ± 0.04 |
| Oxygen |
20.946 |
|
Helium |
5.239 ± 0.004 |
| Argon |
0.934 |
|
Krypton |
1.139 ± 0.01 |
| Carbon Dioxide |
0.033 |
|
Hydrogen |
0.5 |
| Rare Gases |
0.003 |
|
Xenon |
0.086 ± 0.001 |
|
|
|
Radon |
6 x 10-14 |
CYLINDER CONNECTIONS (Air):
Standard CGA V-1 Cylinder Connection upto 3000 psig: CGA 346
Standard CGA V-1 Cylinder Connection from 3001 to 5000 psig: CGA 702
Standard CGA V-1 Cylinder Connection for yoke: CGA 950
Standard CGA V-1 Cylinder Connection for cryogenic liquid: CGA 440
|
