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APPENDIX:
Average Specific Heats of Vapors a
Average specific heat, C (Btu/scf ºF) b,c
Temperature p
(ºF) Air H O O N CO CO H CH C H C H
2 2 2 2 2 4 2 4 2 6
77 0.0180 0.0207 0.0181 0.0180 0.0180 0.0230 0.0178 0.0221 0.0270 0.0326
212 0.0180 0.0209 0.0183 0.0180 0.0180 0.0239 0.0179 0.0232 0.0293 0.0356
392 0.0181 0.0211 0.0186 0.0181 0.0181 0.0251 0.0180 0.0249 0.0324 0.0395
572 0.0183 0.0212 0.0188 0.0182 0.0183 0.0261 0.0180 0.0266 0.0353 0.0432
752 0.0185 0.0217 0.0191 0.0183 0.0184 0.0270 0.0180 0.0283 0.0379 0.0468
932 0.0187 0.0221 0.0194 0.0185 0.0186 0.0278 0.0181 0.0301 0.0403 0.0501
1112 0.0189 0.0224 0.0197 0.0187 0.0188 0.0286 0.0181 0.0317 0.0425 0.0532
1292 0.0191 0.0228 0.0199 0.0189 0.0190 0.0292 0.0182 0.0333 0.0445 0.0560
1472 0.0192 0.0232 0.0201 0.0190 0.0192 0.0298 0.0182 0.0348 0.0464 0.0587
1652 0.0194 0.0235 0.0203 0.0192 0.0194 0.0303 0.0183 0.0363 0.0481 0.0612
1832 0.0196 0.0239 0.0205 0.0194 0.0196 0.0308 0.0184 0.0376 0.0497 0.0635
2012 0.0198 0.0243 0.0207 0.0196 0.0198 0.0313 0.0185 0.0389 0.0512 0.0656
2192 0.0199 0.0246 0.0208 0.0197 0.0199 0.0317 0.0186 0.0400 0.0525 0.0676
a Average for the temperature interval 77ºF and the specified temperature.
b Based on 70ºF and 1 atm.
c To convert to Btu/lb-ºF basis, multiply by 392 and divide by the molecular weight of the compound.
To convert to Btu/lb-mol-ºF, multiply by 392.
Source: ref. 3, Section 4.8.6.