Air - Thermal Diffusivity vs. Temperature and Pressure

Calculate and display thermal diffusivity of air at varying temperatures and pressures. Thermal diffusivity (α) is the rate of heat transfer of a material, calculated as α = k / (ρ × CP), where k is thermal conductivity, ρ is density, and CP is specific heat capacity at constant pressure. Results shown in SI units (m²/s) and Imperial units (ft²/s).

Temperature (K)	Temperature (°C)	Temperature (°F)	Thermal Diffusivity at 1 bara (×10⁻⁶ m²/s)	Thermal Diffusivity at 5 bara (×10⁻⁶ m²/s)	Thermal Diffusivity at 10 bara (×10⁻⁶ m²/s)	Thermal Diffusivity at 20 bara (×10⁻⁶ m²/s)
60	-213	-352	0.0941	0.0942	0.0944	0.0947
80	-193	-316	1.59	0.0823	0.0826	0.0834
100	-173	-280	2.56	0.408	0.0643	0.0659
120	-153	-244	3.79	0.684	0.293	0.0814
140	-133	-208	5.21	0.983	0.455	0.189
180	-93.2	-136	8.58	1.68	0.815	0.385
200	-73.2	-99.7	10.5	2.07	1.02	0.49
220	-53.2	-63.7	12.6	2.5	1.23	0.602
240	-33.2	-27.7	14.9	2.96	1.46	0.721
260	-13.2	8.3	17.3	3.44	1.67	0.847
273.2	0	32	19	3.78	1.86	0.94
280	6.9	44.3	19.9	3.96	1.97	0.979
288.7	15.6	60	21	4.2	2.1	1.05
300	26.9	80.3	22.6	4.5	2.25	1.12
320	46.9	116	25.4	5.07	2.53	1.26
340	66.9	152	28.3	5.67	2.83	1.41
360	86.9	188	31.4	6.28	3.14	1.57
380	107	224	34.6	6.92	3.46	1.73
400	127	260	37.9	7.58	3.79	1.9
500	227	440	55.7	11.2	5.59	2.8
600	327	620	75.4	15.1	7.57	3.8
700	427	800	96.8	19.4	9.71	4.88
800	527	980	119.7	24	12	6.03
900	627	1160	144.2	28.9	14.5	7.26
1000	727	1340	169.6	34.1	17.1	8.57
1100	827	1520	198.1			19.9
1500	1227	2240	326.7			32.7
1900	1627	2960	483.7			48.5