Carbon
Dioxide (CO2)
DESCRIPTION (Carbon Dioxide):
Carbon Dioxide is a non-flammable,
colorless, odorless gas. It is shipped in high pressure steel cylinders as a liquid under
its own vapor pressure of 830 psig at 70° F. There are many uses for Carbon Dioxide some
of the more typical are refrigeration, carbonation and as the extinguishing agent in fire
extinguishers.
PHYSICAL CONSTANTS (Carbon
Dioxide):
| Molecular Weight: |
44.01 |
| Vapor Pressure of pure liquid
@ 70° F.: |
830 psig |
| Specific Volume @ 70° F., 1
atm.: |
8.76 cu.ft/lb |
| Sublimation Point @ 1.0 atm. : |
-109.3° F |
| Triple Point @ 5.11 atm. : |
-69.9° F |
| Specific Gravity, Gas @ 0° C.,
1 atm. (Air = 1): |
1.521 |
| Critical Temperature: |
87.8° F |
| Critical Pressure: |
1071.6 psia |
| Critical Density: |
0.468 g/ml |
| Latent Heat of Vaporization @
t.p.: |
149.6 BTU/lb |
| Latent Heat of Vaporization @
0° C: |
101.03 BTU/lb |
| Specific Heat, Gas @ 25° C.,
1 atm. Cp: |
0.205 cal/g.° C |
| Specific Heat, Gas @ 25° C.,
1 atm. Cv: |
0.1565 cal/g.° C |
| Specific Heat Ratio, Gas @
25° C., 1 atm., Cp/Cv: |
1.310 |
| Thermal Conductivity, Gas @
32° F : |
0.0085 BTU/(hr) (ft2 )(° F/ft) |
| Thermal Conductivity, Gas @
212° F |
0.0133 BTU/(hr) (ft2 )(° F/ft) |
| Viscosity, Liquid @ 70° F., 1
atm. : |
0.0148 centipoise |
| Heat of Formation, Gas @
25° C.: |
-94.054 kcal/mole |
| Entropy, Gas @ 25° C., 1 atm.
: |
51.072 cal/mol ° C |
| Solubility in Water @ 0° C.,
1 atm. : |
0.759 vol/vol water |
COMPATIBLE MATERIALS (Carbon
Dioxide):
Carbon Dioxide in
it's gaseous form is a relatively inert material and therefore can be used in combination
with any available metals. However, liquid Carbon Dioxide has the potential to form
Carbonic Acid and only materials resistant to this acid will need to be used.
CYLINDER CONNECTIONS (Carbon Dioxide):
Standard CGA V-1 Cylinder Connection threaded: CGA 320
Standard CGA V-1 Cylinder Connection yoke: CGA 940
Standard CGA V-1 Cylinder Connection Ultra High Integrity: CGA 716
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