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properties of air

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					                                   Molecular
                                    Mass
           Ratio compared to Dry
                  Air (%)            -M-                     Boiling Point
                                               Chemical
 Gas       By volume By weight     (kg/kmol)    Symbol     (K)         ( o C)
Oxygen       20.95        23.2        32         O2       90.2        -182.95
Nitrogen     78.09        75.47     28.02        N2       77.4        -195.79
Carbon
Dioxide      0.03         0.046     44.01        CO2      194.7         -78.5
Hydrogen    0.00005        ~0        2.02        H2       20.3        -252.87
 Argon       0.933        1.28      39.94         Ar      84.2          -186
 Neon       0.0018       0.0012     20.18        Ne       27.2          -246
 Helium     0.0005       0.00007       4         He        4.2          -269
Krypton     0.0001       0.0003      83.8         Kr      119.8        -153.4
                    -6
 Xenon       9 10        0.00004    131.29       Xe       165.1        -108.1
STP
Temperature                               273.15 K                       0.00
Pressure                                   1013 mbar                    101.3




specific heat at constant pressure   cp                     1005    J kg-1 K-1
specific heat at constant volume     cv                      718    J kg-1 K-1
ratio of specific heats              γ                        1.4
density at 273K, 1013mbar            ρ0                    1.293       kg m-3
viscosity at STP                     µ                 1.73×10-5    kg m-1s-1
kinematic viscosity at STP           ν = µ/ρ0          1.34×10-5        m2s-1
thermal conductivity at STP          k                 2.40×10-2    Wm-2K-1
gas constant for dry air             R                    287.05    J kg-1K-2
C        32 F
kPa   14.69 psi
                           Specific
                             heat      Thermal       Kinematic
Temperature   Density      capacity   conductivity    viscosity
    -t -        -ρ-         - cp -        -l -          -ν -


   ( o C)     (kg/m 3 )   (kJ/kg K)   (W/m K)         (m 2 /s)
   -150        2.793        1.026       0.0116       3.0800E-06
   -100         1.98        1.009        0.016       5.9500E-06
    -50        1.534        1.005       0.0204       9.5500E-06
     0         1.293        1.005       0.0243       1.3300E-05
    20         1.205        1.005       0.0257       1.5110E-05
    40         1.127        1.005       0.0271       1.6970E-05
    60         1.067        1.009       0.0285       1.8900E-05
    80            1         1.009       0.0299       2.0940E-05
    100        0.946        1.009       0.0314       2.3060E-05
    120        0.898        1.013       0.0328       2.5230E-05
    140        0.854        1.013       0.0343       2.7550E-05
    160        0.815        1.017       0.0358       2.9850E-05
    180        0.779        1.022       0.0372       3.2290E-05
    200        0.746        1.026       0.0386       3.4630E-05
    250        0.675        1.034       0.0421       4.1170E-05
    300        0.616        1.047       0.0454       4.7850E-05
    350        0.566        1.055       0.0485       5.5050E-05
    400        0.524        1.068       0.0515       6.2530E-05


                                                         1 N s/m 2 = 1 Pa s = 1 kg/m s= 10 poise
                                                         1 m 2 /s = 1 x 10 4 cm 2 /s =1 x 10
                                   Expansion      Prandtl's
            Dynamic Viscosity      coefficient    number
                    m                 -b-          - Pr -


               (kg/m sec)        (1/K) x 10 -3
               8.6024E-06             8.21          0.76
               1.1781E-05             5.82          0.74
               1.4650E-05             4.51          0.725
               1.7197E-05             3.67          0.715
               1.8208E-05             3.43          0.713
               1.9125E-05             3.2           0.711
               2.0166E-05              3            0.709
               2.0940E-05             2.83          0.708
               2.1815E-05             2.68          0.703
               2.2657E-05             2.55           0.7
               2.3528E-05             2.43          0.695
               2.4328E-05             2.32          0.69
               2.5154E-05             2.21          0.69
               2.5834E-05             2.11          0.685
               2.7790E-05             1.91          0.68
               2.9476E-05             1.75          0.68
               3.1158E-05             1.61          0.68
               3.2766E-05             1.49


1 N s/m 2 = 1 Pa s = 1 kg/m s= 10 poise = 1,000 milliPa s
1 m 2 /s = 1 x 10 4 cm 2 /s =1 x 10 4 stokes = 1 x 10 6 centistokes
                              Kinematic
Temperature      Density       viscosity
    -t -           -ρ-           -ν -
       oF                3
   (        )   (slugs/ft )    (ft 2 /s)
   -238         0.005419314   3.0800E-06
   -148         0.003841834   3.0800E-06
       -58      0.002976451   3.0800E-06
       32       0.002508834   3.0800E-06
       68       0.002338086   3.0800E-06
    104         0.002186741   3.0800E-06
    140         0.002070321   3.0800E-06
    176         0.00194032    3.0800E-06
    212         0.001835543   3.0800E-06
    248         0.001742407   3.0800E-06
    284         0.001657033   3.0800E-06
    320         0.001581361   3.0800E-06
    356         0.001511509   3.0800E-06
    392         0.001447479   3.0800E-06
    482         0.001309716   3.0800E-06
    572         0.001195237   3.0800E-06
    662         0.001098221   3.0800E-06
    752         0.001016728   3.0800E-06
 Dynamic       Prandtl's
 Viscosity     number
     m          - Pr -
 lb/ft^2 sec
1.7967E-07       0.76
2.4605E-07       0.74
3.0596E-07      0.725
3.5916E-07      0.715
3.8027E-07      0.713
3.9944E-07      0.711
4.2118E-07      0.709
4.3734E-07      0.708
4.5561E-07      0.703
4.7319E-07       0.7
4.9139E-07      0.695
5.0809E-07       0.69
5.2535E-07       0.69
5.3955E-07      0.685
5.8040E-07       0.68
6.1561E-07       0.68
6.5075E-07       0.68
6.8433E-07       0.76
      alt is altitude in kilometers.
      sigma is density divided by sea-level density.
      delta is pressure divided by sea-level pressure.
      theta is temperature divided by sea-level temperature.
      temp is temperature in kelvins.
      press is pressure in newtons per square meter.
      dens is density in kilograms per cubic meter.
      a is the speed of sound in meters per second.
      visc is viscosity in 10**(-6) kilograms per meter-second.
      k.visc is kinematic viscosity in square meters per second.

alt            sigma       delta       theta       temp        press       dens       a           visc
km                                                 K           N/sq.m      kg/cu.m m/s            kg/m-s
          -2 1.21E+00 1.26E+00            1.0451       301.2    1.28E+05    1.48E+00      347.9        18.51
           0 1.00E+00 1.00E+00                 1       288.1    1.01E+05    1.23E+00      340.3        17.89
           2    8.22E-01    7.85E-01      0.9549       275.2    7.95E+04    1.01E+00      332.5        17.26
           4    6.69E-01    6.09E-01      0.9098       262.2    6.17E+04     8.19E-01     324.6        16.61
           6    5.39E-01    4.66E-01      0.8648       249.2    4.72E+04     6.60E-01     316.5        15.95
           8    4.29E-01    3.52E-01      0.8198       236.2    3.57E+04     5.26E-01     308.1        15.27
          10    3.38E-01    2.62E-01      0.7748       223.3    2.65E+04     4.14E-01     299.5        14.58
          12    2.55E-01    1.91E-01      0.7519       216.6    1.94E+04     3.12E-01     295.1        14.22
          14    1.86E-01    1.40E-01      0.7519       216.6    1.42E+04     2.28E-01     295.1        14.22
          16    1.36E-01    1.02E-01      0.7519       216.6    1.04E+04     1.67E-01     295.1        14.22
          18    9.93E-02    7.47E-02      0.7519       216.6    7.57E+03     1.22E-01     295.1        14.22
          20    7.26E-02    5.46E-02      0.7519       216.6    5.53E+03     8.89E-02     295.1        14.22
          22    5.27E-02    3.99E-02      0.7585       218.6    4.05E+03     6.45E-02     296.4        14.32
          24    3.83E-02    2.93E-02      0.7654       220.6    2.97E+03     4.69E-02     297.7        14.43
          26    2.80E-02    2.16E-02      0.7723       222.5    2.19E+03     3.43E-02     299.1        14.54
          28    2.05E-02    1.60E-02      0.7792       224.5    1.62E+03     2.51E-02     300.4        14.65
          30    1.50E-02    1.18E-02      0.7861       226.5    1.20E+03     1.84E-02     301.7        14.75
          32    1.11E-02    8.77E-03       0.793       228.5    8.89E+02     1.36E-02      303         14.86
          34    8.07E-03    6.55E-03      0.8112       233.7    6.63E+02     9.89E-03     306.5        15.14
          36    5.92E-03    4.92E-03      0.8304       239.3    4.99E+02     7.26E-03     310.1        15.43
          38    4.38E-03    3.72E-03      0.8496       244.8    3.77E+02     5.37E-03     313.7        15.72
          40    3.26E-03    2.83E-03      0.8688       250.4    2.87E+02     4.00E-03     317.2        16.01
          42    2.44E-03    2.17E-03       0.888       255.9    2.20E+02     3.00E-03     320.7        16.29
          44    1.84E-03    1.67E-03      0.9072       261.4    1.70E+02     2.26E-03     324.1        16.57
          46    1.40E-03    1.30E-03      0.9263       266.9    1.31E+02     1.71E-03     327.5        16.85
          48    1.07E-03    1.01E-03      0.9393       270.6    1.02E+02     1.32E-03     329.8        17.04
          50    8.38E-04    7.87E-04      0.9393       270.6    7.98E+01     1.03E-03     329.8        17.04
          52    6.58E-04    6.14E-04      0.9336        269     6.22E+01     8.06E-04     328.8        16.96
          54    5.22E-04    4.77E-04      0.9145       263.5    4.83E+01     6.39E-04     325.4        16.68
          56    4.12E-04    3.69E-04      0.8954        258     3.74E+01     5.04E-04      322          16.4
          58    3.23E-04    2.83E-04      0.8763       252.5    2.87E+01     3.96E-04     318.6        16.12
          60    2.53E-04    2.17E-04      0.8573        247     2.20E+01     3.10E-04     315.1        15.84
62   1.96E-04   1.65E-04   0.8382    241.5   1.67E+01   2.41E-04   311.5   15.55
64   1.52E-04   1.24E-04   0.8191     236    1.26E+01   1.86E-04    308    15.26
66   1.17E-04   9.34E-05   0.8001    230.5   9.46E+00   1.43E-04   304.4   14.97
68   8.91E-05   6.96E-05   0.7811    225.1   7.05E+00   1.09E-04   300.7   14.67
70   6.76E-05   5.15E-05    0.762    219.6   5.22E+00   8.28E-05   297.1   14.38
72   5.09E-05   3.79E-05   0.7436    214.3   3.84E+00   6.24E-05   293.4   14.08
74   3.79E-05   2.76E-05      0.73   210.3   2.80E+00   4.64E-05   290.7   13.87
76   2.80E-05   2.01E-05   0.7164    206.4   2.03E+00   3.43E-05    288    13.65
78   2.06E-05   1.45E-05   0.7029    202.5   1.47E+00   2.52E-05   285.3   13.43
80   1.51E-05   1.04E-05   0.6893    198.6   1.05E+00   1.85E-05   282.5   13.21
82   1.10E-05   7.40E-06   0.6758    194.7   7.50E-01   1.34E-05   279.7   12.98
84   7.91E-06   5.24E-06   0.6623    190.8   5.31E-01   9.69E-06   276.9   12.76
86   5.68E-06   3.68E-06   0.6488    186.9   3.73E-01   6.96E-06   274.1   12.53
k.visc
sq.m/s
  1.25E-05
  1.46E-05
  1.71E-05
  2.03E-05
  2.42E-05
  2.90E-05
  3.53E-05
  4.56E-05
  6.24E-05
  8.54E-05
  1.17E-04
  1.60E-04
  2.22E-04
  3.07E-04
  4.24E-04
  5.84E-04
  8.01E-04
  1.10E-03
  1.53E-03
  2.13E-03
  2.93E-03
  4.01E-03
  5.44E-03
  7.34E-03
  9.83E-03
  1.29E-02
  1.66E-02
  2.10E-02
  2.61E-02
  3.25E-02
  4.07E-02
  5.11E-02
6.46E-02
8.20E-02
1.05E-01
1.34E-01
1.74E-01
2.26E-01
2.99E-01
3.98E-01
5.32E-01
7.16E-01
9.68E-01
1.32E+00
1.80E+00
      alt is altitude in thousands of feet.
      sigma is density divided by sea-level density.
      delta is pressure divided by sea-level pressure.
      theta is temperature divided by sea-level temperature.
      temp is temperature in degrees Rankine.
      pressure is pressure in pounds per square foot.
      dens is density in slugs per cubic foot.
      a is the speed of sound in feet per second.
      visc is viscosity in 10**(-6) slugs per foot-second.
      k.visc is kinematic viscosity in square feet per second.
      ratio is speed of sound divided by kinematic viscosity times 10**(-6)


alt        sigma       delta       theta       temp      press      dens       a          visc
                                               R         lb/ft^2    slugs/ft^3 ft/sec     slugs/(ft-sec)
      -1      1.0296      1.0367      1.0069       522.2     2193.8 0.002447       1120.3           0.376
      0            1           1           1       518.7     2116.2 0.002377       1116.5           0.374
      1       0.9711      0.9644      0.9931       515.1     2040.9 0.002308       1112.6           0.372
      2       0.9428      0.9298      0.9863       511.5     1967.7 0.002241       1108.7            0.37
      3       0.9151      0.8963      0.9794        508      1896.7 0.002175       1104.9           0.368
      4       0.8881      0.8637      0.9725       504.4     1827.7 0.002111         1101           0.366
      5       0.8617      0.8321      0.9656       500.8     1760.9 0.002048       1097.1           0.364
      6       0.8359      0.8014      0.9588       497.3       1696 0.001987       1093.2           0.362
      7       0.8107      0.7717      0.9519       493.7     1633.1 0.001927       1089.3            0.36
      8       0.7861      0.7429       0.945       490.2     1572.1 0.001869       1085.3           0.358
      9       0.7621      0.7149      0.9381       486.6     1512.9 0.001811       1081.4           0.355
      10      0.7386      0.6878      0.9313        483      1455.6 0.001756       1077.4           0.353
      11      0.7157      0.6616      0.9244       479.5     1400.1 0.001701       1073.4           0.351
      12      0.6933      0.6362      0.9175       475.9     1346.2 0.001648       1069.4           0.349
      13      0.6715      0.6115      0.9107       472.3     1294.1 0.001596       1065.4           0.347
      14      0.6502      0.5877      0.9038       468.8     1243.6 0.001546       1061.4           0.345
      15      0.6295      0.5646      0.8969       465.2     1194.8 0.001496       1057.4           0.343
      16      0.6092      0.5422      0.8901       461.7     1147.5 0.001448       1053.3           0.341
      17      0.5895      0.5206      0.8832       458.1     1101.7 0.001401       1049.2           0.339
      18      0.5702      0.4997      0.8763       454.5     1057.5 0.001355       1045.1           0.337
      19      0.5514      0.4795      0.8695        451      1014.7 0.001311         1041           0.335
      20      0.5332      0.4599      0.8626       447.4       973.3 0.001267      1036.9           0.332
      21      0.5153       0.441      0.8558       443.9       933.3 0.001225      1032.8            0.33
      22       0.498      0.4227      0.8489       440.3       894.6 0.001184      1028.6           0.328
      23      0.4811      0.4051       0.842       436.7       857.2 0.001144      1024.5           0.326
      24      0.4646       0.388      0.8352       433.2       821.2 0.001104      1020.3           0.324
      25      0.4486      0.3716      0.8283       429.6       786.3 0.001066      1016.1           0.322
      26       0.433      0.3557      0.8215       426.1       752.7 0.001029      1011.9           0.319
      27      0.4178      0.3404      0.8146       422.5       720.3 0.000993      1007.7           0.317
      28      0.4031      0.3256      0.8077        419          689 0.000958      1003.4           0.315
29   0.3887   0.3113   0.8009   415.4   658.8   0.000924   999.1   0.313
30   0.3747   0.2975    0.794   411.8   629.7   0.000891   994.8   0.311
31   0.3611   0.2843   0.7872   408.3   601.6   0.000858   990.5   0.308
32    0.348   0.2715   0.7803   404.7   574.6   0.000827   986.2   0.306
33   0.3351   0.2592   0.7735   401.2   548.5   0.000797   981.9   0.304
34   0.3227   0.2474   0.7666   397.6   523.5   0.000767   977.5   0.302
35   0.3106    0.236   0.7598   394.1   499.3   0.000738   973.1      0.3
36   0.2988    0.225   0.7529   390.5   476.1    0.00071   968.7   0.297
37   0.2852   0.2145   0.7519    390    453.9   0.000678   968.1   0.297
38   0.2719   0.2044   0.7519    390    432.6   0.000646   968.1   0.297
39   0.2592   0.1949   0.7519    390    412.4   0.000616   968.1   0.297
40   0.2471   0.1858   0.7519    390    393.1   0.000587   968.1   0.297
41   0.2355   0.1771   0.7519    390    374.7    0.00056   968.1   0.297
42   0.2245   0.1688   0.7519    390    357.2   0.000534   968.1   0.297
43    0.214   0.1609   0.7519    390    340.5   0.000509   968.1   0.297
44    0.204   0.1534   0.7519    390    324.6   0.000485   968.1   0.297
45   0.1945   0.1462   0.7519    390    309.4   0.000462   968.1   0.297
46   0.1854   0.1394   0.7519    390     295    0.000441   968.1   0.297
47   0.1767   0.1329   0.7519    390    281.2    0.00042   968.1   0.297
48   0.1685   0.1267   0.7519    390    268.1   0.000401   968.1   0.297
49   0.1606   0.1208   0.7519    390    255.5   0.000382   968.1   0.297
50   0.1531   0.1151   0.7519    390    243.6   0.000364   968.1   0.297
51    0.146   0.1097   0.7519    390    232.2   0.000347   968.1   0.297
52   0.1391   0.1046   0.7519    390    221.4   0.000331   968.1   0.297
53   0.1326   0.0997   0.7519    390     211    0.000315   968.1   0.297
54   0.1264   0.0951   0.7519    390    201.2   0.000301   968.1   0.297
55   0.1205   0.0906   0.7519    390    191.8   0.000287   968.1   0.297
56   0.1149   0.0864   0.7519    390    182.8   0.000273   968.1   0.297
57   0.1096   0.0824   0.7519    390    174.3    0.00026   968.1   0.297
58   0.1044   0.0785   0.7519    390    166.2   0.000248   968.1   0.297
59   0.0996   0.0749   0.7519    390    158.4   0.000237   968.1   0.297
60   0.0949   0.0714   0.7519    390     151    0.000226   968.1   0.297
61   0.0905    0.068   0.7519    390     144    0.000215   968.1   0.297
62   0.0863   0.0649   0.7519    390    137.3   0.000205   968.1   0.297
63   0.0822   0.0618   0.7519    390    130.9   0.000196   968.1   0.297
64   0.0784    0.059   0.7519    390    124.8   0.000186   968.1   0.297
65   0.0747   0.0562   0.7519    390    118.9   0.000178   968.1   0.297
k.visc     ratio
ft^2/sec
  1.54E-04        7.3
  1.57E-04        7.1
  1.61E-04       6.91
  1.65E-04       6.72
  1.69E-04       6.54
  1.73E-04       6.36
  1.78E-04       6.18
  1.82E-04       6.01
  1.87E-04       5.84
  1.91E-04       5.67
  1.96E-04       5.51
  2.01E-04       5.35
  2.07E-04        5.2
  2.12E-04       5.05
  2.18E-04        4.9
  2.23E-04       4.75
  2.29E-04       4.61
  2.35E-04       4.47
  2.42E-04       4.34
  2.48E-04       4.21
  2.55E-04       4.08
  2.62E-04       3.95
  2.70E-04       3.83
  2.77E-04       3.71
  2.85E-04       3.59
  2.93E-04       3.48
  3.02E-04       3.37
  3.10E-04       3.26
  3.19E-04       3.15
  3.29E-04       3.05
3.39E-04   2.95
3.49E-04   2.85
3.59E-04   2.76
3.70E-04   2.66
3.82E-04   2.57
3.93E-04   2.48
4.06E-04    2.4
4.19E-04   2.31
4.38E-04   2.21
4.59E-04   2.11
4.82E-04   2.01
5.06E-04   1.91
5.30E-04   1.83
5.56E-04   1.74
5.84E-04   1.66
6.12E-04   1.58
6.42E-04   1.51
6.74E-04   1.44
7.07E-04   1.37
7.41E-04   1.31
7.78E-04   1.24
8.16E-04   1.19
8.56E-04   1.13
8.98E-04   1.08
9.42E-04   1.03
9.88E-04   0.98
1.04E-03   0.93
1.09E-03   0.89
1.14E-03   0.85
1.20E-03   0.81
1.25E-03   0.77
1.32E-03   0.74
1.38E-03    0.7
1.45E-03   0.67
1.52E-03   0.64
1.59E-03   0.61
1.67E-03   0.58

				
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posted:8/24/2012
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