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Volver a Tablas| Propiedades fisicas de los gases |
Physical Properties ofGases(Approximate Values Calculated at 68°F and 147 psia)cp = specific heat at constant pressure
cv = specific heat at constant volume  Name of Gas | Chemical Formula or Symbol | Approx. Molecular Weight
M | Weight Density, Pounds per Cubic Foot
p | Specific Gravity Relative to Air
Sg | Individual Gas Constant
R | Specific Heat at Room Temperature Btu/Lb °F | Heat Capacity per Cubic Foot | k
equal tocp/cv |
| | | | | | cp | cv | cp | cv | |
Acetylene (ethyne) | C2H2 | 26.0 | .0682 | 0.907 | 59.4 | 0.350 | 0.269 | .0239 | .0184 | 1.30 |
Air | -- | 29.0 | .0752 | 1.000 | 53.3 | 0.241 | 0.172 | .0181 | .0129 | 1.40 |
Ammonia | H3N | 17.0 | .0448 | .0596 | 91.0 | 0.523 | 0.396 | .0234 | .0178 | 1.32 |
Argon | Ar | 39.9 | .1037 | 1.379 | 38.7 | 0.124 | 0.074 | .0129 | .0077 |1.67 |
Butane | C4H10 | 58.1 | .1554 | 2.067 | 26.5 | 0.395 | 0.356 | .0614 | .0553 | 1.11 |
Carbon dioxide | CO2 | 44.0 | .1150 | 1.529 | 35.1 | 0.205 | 0.158 | .0236 | .0181 | 1.30 |
Carbon monoxide | CO | 28.0 | .0727 | 0.967 | 55.2 | 0.243 | 0.173 | .0177 | .0126 | 1.40 |
Chlorine | Cl | 70.9 | .1869 | 2.486 | 21.8 | 0.115 | 0.086 | .0215 | .0162 | 1.33 |
Ethane | C2H6 | 30.0 | .0789 |1.049 | 51.5 | 0.386 | 0.316 | .0305 | .0250 | 1.22 |
Ethylene | C2H4 | 28.0 | .0733 | 0.975 | 55.1 | 0.400 | 0.329 | .0293 | .0240 | 1.22 |
Helium | He | 4.0 | .01039 | 0.1381 | 386.3 | 1.250 | 0.754 | .0130 | .0078 | 1.66 |
Hydrogen chloride | HCl | 36.5 | .0954 | 1.268 | 42.4 | 0.191 | 0.135 | .0182 | .0129 | 1.41 |
Hydrogen | H | 2.0 | .00523 | 0.0695 | 766.8 | 3.420 | 2.426 | .0179 |.0127 | 1.41 |
Hydrogen sulphide | H2S | 34.1 | .0895 | 1.190 | 45.2 | 0.243 | 0.187 | .0217 | .0167 | 1.30 |
Methane | CH4 | 16.0 | .0417 | 0.554 | 96.4 | 0.593 | 0.449 | .0247 | .0187 | 1.32 |
Methyl chloride | CH3Cl | 50.5 | .1342 | 1.785 | 30.6 | 0.240 | 0.200 | .0322 | .0268 | 1.20 |
Natural gas | -- | 19.5 | .0502 | 0.667 | 79.1 | 0.560 | 0.441 | .0281 | .0221 | 1.27 |
Nitricoxide | NO | 30.0 | .0780 | 1.037 | 51.5 | 0.231 | 0.165 | .0180 | .0129 | 1.40 |
Nitrogen | N | 28.0 | .0727 | 0.967 | 55.2 | 0.247 | 0.176 | .0180 | .0127 | 1.41 |
Nitrous oxide | N2O | 44.0 | .1151 | 1.530 | 35.1 | 0.221 | 0.169 | .0254 | .0194 | 1.31 |
Oxygen | O | 32.0 | .0831 | 1.105 | 48.3 | 0.217 | 0.155 | .0180 | .0129 | 1.40 |
Propane | C3H8 | 44.1 | .1175 | 1.562 | 35.0 | 0.393 |0.342 | .0462 | .0402 | 1.15 |
Propene (propylene) | C3H6 | 42.1 | .1091 | 1.451 | 36.8 | 0.358 | 0.314 | .0391 | .0343 | 1.14 |
Sulphur dioxide | SO2 | 64.1 | .1703 | 2.264 | 24.0 | 0.154 | 0.122 | .0262 | .0208 | 1.26 |
Note: Values for natural gas and air are representative only. Exact characteristics require knowledge of specific constituents.  |
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Equivalents of Degrees API, Degrees Baumé, Specific Gravity,
Weight Density, and Pounds per Gallon at 60°F/60°F
Degrees on
API or
Baumé Scale | Values for API
Scale Oil | Values for Baumé Scale |
| | Liquids Lighter Than Water | Liquids Heavier Than Water |
| Specific Gravity
S | Weight Density,lb/ft³
p | Pounds
per Gallon | Specific Gravity
S | Weight
Density, lb/ft³
p | Pounds per Gallon | Specific Gravity
S | Weight
Density, lb/ft³
p | Pounds per Gallon |
0 |   |   |   |   |   |   | 1.0000 | 62.36 | 8.337 |
2 |   |   |   |   |   |   | 1.0140 | 63.24 | 8.454 |
4 |   |   |   |   |   |   | 1.0284 | 64.14 | 8.574 |
6 |   |   |   |   |   |   | 1.0432 | 65.06 | 8.697 |
8...