Prandtl Number Of Air

The prandtl number of air is around 0.7 as many other gases at 1 atm.
The Prandtl Number is a dimensionless number approaching the proportion of momentum diffusivity and thermal diffusivity.
Prandtl number equation is defined as:

where:
ν is the kinematic viscosity, ν = μ / ρ.
μ is dynamic viscosity, (SI units: Pa s = N s/m2).
ρ is density, (SI units: kg/m3).
α is the thermal diffusivity, α = k / (ρ cp).
k is thermal conductivity, (SI units: W/m·K)
cp is specific heat, (SI units: J/kg·K)
ρ is density, (SI units: kg/m3).
The values of μ, cp and k are acknowledged to change with temperature consequently the Prandtl number will change with temperature.
The values of μ, cp and k are only very weak functions of pressure so the Prandtl number presumed independent of pressure.

Prandtl Number of Air

Prandtl Number of Dry air at 1 atm pressure:

Temp, C	Temp, F	Temp, K	Prandtl Number, Pr
-193.15	-315.67	80	mix
-183.15	-297.67	90	0.7960
-173.15	-279.67	100	0.7860
-153.15	-243.67	120	0.7730
-133.15	-207.67	140	0.7630
-113.15	-171.67	160	0.7540
-93.15	-135.67	180	0.7450
-73.15	-99.67	200	0.7380
-33.15	-27.67	240	0.7240
6.85	44.33	280	0.7100
26.85	80.33	300	0.7050
76.85	170.33	350	0.6990
126.85	260.33	400	0.6940
176.85	350.33	450	0.6910
226.85	440.33	500	0.6890
326.85	620.33	600	0.6900
426.85	800.33	700	0.6960
526.85	980.33	800	0.7050
626.85	1160.33	900	0.7090
726.85	1340.33	1000	0.7110

Note: For ideal gases, the properties cp, k, m, and Pr are independent of pressure.

Prandtl number of air (dry Air) Table at temperature between 70 deg C and 2000 deg C :

Temp, C	Temp, F	Temp, K	Prandtl
Number, Pr
70	158	343.15	0.7177
80	176	353.15	0.7154
90	194	363.15	0.7132
100	212	373.15	0.7111
120	248	393.15	0.7073
140	284	413.15	0.7041
160	320	433.15	0.7014
180	356	453.15	0.6992
200	392	473.15	0.6974
250	482	523.15	0.6946
300	572	573.15	0.6935
350	662	623.15	0.6937
400	752	673.15	0.6948
450	842	723.15	0.6965
500	932	773.15	0.6986
600	1112	873.15	0.7037
700	1292	973.15	0.7092
800	1472	1073.15	0.7149
900	1652	1173.15	0.7206
1000	1832	1273.15	0.7260
1500	2732	1773.15	0.7478
2000	3632	2273.15	0.7539

Note: For ideal gases, the properties cp, k, m, and Pr are independent of pressure.

Prandtl Number of Air @ Different Pressure

Temp, C	Temp, F	10 bar	30 bar	50 bar	70 bar	100 bar
-193.15	-315.67	2.32	2.37	2.42	2.48	2.57
-183.15	-297.67	1.77	1.79	1.82	1.85	1.91
-173.15	-279.67	1.54	1.53	1.53	1.53	1.55
-153.15	-243.67	0.89	1.65	1.48	1.4	1.34
-133.15	-207.67	0.82	1.2	2.14	2.07	1.52
-113.15	-171.67	0.78	0.92	1.13	1.37	1.72
-93.15	-135.67	0.763	0.83	0.932	1.07	1.25
-73.15	-99.67	0.749	0.788	0.841	0.9	1
-33.15	-27.67	0.729	0.746	0.767	0.8	0.82
6.85	44.33	0.713	0.721	0.731	0.742	0.76
26.85	80.33	0.708	0.715	0.721	0.728	0.742
76.85	170.33	0.699	0.703	0.707	0.711	0.716
126.85	260.33	0.694	0.696	0.698	0.7	0.704
176.85	350.33	0.691	0.692	0.693	0.694	0.696
226.85	440.33	0.689	0.689	0.69	0.69	0.691
326.85	620.33	0.69	0.689	0.689	0.689	0.69
426.85	800.33	0.695	0.695	0.695	0.695	0.695
526.85	980.33	0.704	0.704	0.703	0.703	0.702
626.85	1160.33	0.708	0.708	0.708	0.708	0.708
726.85	1340.33	0.711	0.711	0.71	0.71	0.709

Prandtl Number of Air @ Different Temperature

	280 K	300K	500K	1000 K
1	0.71	0.705	0.689	0.711
5	0.711	0.707	0.689	0.711
10	0.713	0.708	0.689	0.711
20	0.717	0.712	0.689	0.711
30	0.721	0.715	0.689	0.711
40	0.726	0.717	0.69	0.71
50	0.731	0.721	0.69	0.71
60	0.737	0.725	0.69	0.71
70	0.742	0.728	0.69	0.71
80	0.75	0.732	0.691	0.709
90	0.75	0.737	0.691	0.709
100	0.76	0.742	0.691	0.709

Prandtl Number Of Air at Different Temperature

Prandtl number of Humid air

Prandtl number of moist air with a relative humidity (RH) varying between 0% and 100%

References:

Thermophysical and transport properties of humid air at temperature range between 0 and 100 C P.T. Tsilingiris *
https://www.researchgate.net/profile/Ingo_Riess/post/What_should_be_the_viscosity_of_Air_Water_Mixture/attachment/5acb4c45b53d2f63c3c4b633/AS%3A613464624070664%401523272772980/download/2007_Properties+of+humid+air.pdf