Table B.4 Thermophysical Properties of Air
T
r
c p
m  10
7
v  10
6
k  10
3
a  10
5
[K]
[kg/m
3
]
[kJ/kg Á K]
[N Á s/m
2 ]
[ m
2 /s]
[W/m Á K]
[m
2
/s]
Pr
200
1.7458
1.007
132.5
7.590
18.1
10.3
0.737
250
1.3947
1.006
159.6
11.44
22.3
15.9
0.720
300
1.1614
1.007
184.6
15.89
26.3
22.5
0.707
350
0.9950
1.009
208.2
20.92
30.0
29.9
0.700
400
0.8711
1.014
230.1
26.41
33.8
38.3
0.690
450
0.7740
1.021
250.7
32.39
37.3
47.2
0.686
500
0.6964
1.030
270.1
38.79
40.7
56.7
0.684
550
0.6329
1.040
288.4
45.57
43.9
66.7
0.683
600
0.5804
1.051
305.8
52.69
46.9
76.9
0.685
650
0.5356
1.063
322.5
60.21
49.7
87.3
0.690
700
0.4975
1.075
338.8
68.10
52.4
98.0
0.695
750
0.4643
1.087
354.6
76.37
54.9
109.
0.702
800
0.4354
1.099
369.8
84.93
57.3
120.
0.709
850
0.4097
1.110
384.3
93.80
59.6
131.
0.716
900
0.3868
1.121
398.1
102.9
62.0
143.
0.720
950
0.3666
1.131
411.3
112.2
64.3
155.
0.723
1000
0.3482
1.141
424.4
121.9
66.7
168.
0.726
Formulas for Interpolation (T = absolute temperature)
r ¼
348:59
T
ðs ¼ 9 Â 10
4 Þ
f ðTÞ ¼ A þ BT þ CT
2
þ DT
3
Standard
f(T )
A
B
C
D
Deviation, s
c p
1.0507
À3.645 Â 10
À4
8.388 Â 10
À7
À3.848 Â 10
À10
4 Â 10
À4
m  10
7
13.554
0.6738
À3.808 Â 10
À4
1.183 Â 10
À7
0.4192 Â 10
À7
k  10
3
À2.450
0.1130
À6.287 Â 10
À5
1.891 Â 10
À8
0.1198 Â 10
À3
a  10
8
À11.064
7.04 Â 10
À2
1.528 Â 10
À4
À4.476 Â 10
À8
0.4417 Â 10
À8
Pr
0.8650
À8.488 Â 10
À4
1.234 Â 10
À6
À5.232 Â 10
À10
1.623 Â 10
À3
Source: From F. P. Incropera and D. P. DeWitt, Fundamentals of Heat and Mass Transfer. Wiley, New York, 1985.
Appendix B Property Data and Conversion Factors 573
T
r
c p
m  10
7
v  10
6
k  10
3
a  10
5
[K]
[kg/m
3
]
[kJ/kg Á K]
[N Á s/m
2 ]
[ m
2 /s]
[W/m Á K]
[m
2
/s]
Pr
200
1.7458
1.007
132.5
7.590
18.1
10.3
0.737
250
1.3947
1.006
159.6
11.44
22.3
15.9
0.720
300
1.1614
1.007
184.6
15.89
26.3
22.5
0.707
350
0.9950
1.009
208.2
20.92
30.0
29.9
0.700
400
0.8711
1.014
230.1
26.41
33.8
38.3
0.690
450
0.7740
1.021
250.7
32.39
37.3
47.2
0.686
500
0.6964
1.030
270.1
38.79
40.7
56.7
0.684
550
0.6329
1.040
288.4
45.57
43.9
66.7
0.683
600
0.5804
1.051
305.8
52.69
46.9
76.9
0.685
650
0.5356
1.063
322.5
60.21
49.7
87.3
0.690
700
0.4975
1.075
338.8
68.10
52.4
98.0
0.695
750
0.4643
1.087
354.6
76.37
54.9
109.
0.702
800
0.4354
1.099
369.8
84.93
57.3
120.
0.709
850
0.4097
1.110
384.3
93.80
59.6
131.
0.716
900
0.3868
1.121
398.1
102.9
62.0
143.
0.720
950
0.3666
1.131
411.3
112.2
64.3
155.
0.723
1000
0.3482
1.141
424.4
121.9
66.7
168.
0.726
Formulas for Interpolation (T = absolute temperature)
r ¼
348:59
T
ðs ¼ 9 Â 10
4 Þ
f ðTÞ ¼ A þ BT þ CT
2
þ DT
3
Standard
f(T )
A
B
C
D
Deviation, s
c p
1.0507
À3.645 Â 10
À4
8.388 Â 10
À7
À3.848 Â 10
À10
4 Â 10
À4
m  10
7
13.554
0.6738
À3.808 Â 10
À4
1.183 Â 10
À7
0.4192 Â 10
À7
k  10
3
À2.450
0.1130
À6.287 Â 10
À5
1.891 Â 10
À8
0.1198 Â 10
À3
a  10
8
À11.064
7.04 Â 10
À2
1.528 Â 10
À4
À4.476 Â 10
À8
0.4417 Â 10
À8
Pr
0.8650
À8.488 Â 10
À4
1.234 Â 10
À6
À5.232 Â 10
À10
1.623 Â 10
À3
Source: From F. P. Incropera and D. P. DeWitt, Fundamentals of Heat and Mass Transfer. Wiley, New York, 1985.
Appendix B Property Data and Conversion Factors 573