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The Observed Properties of Liquid Helium
at the Saturated Vapor Pressure

Chapter 19. Prandtl Number of Helium I

The Prandtl Number is defined as

Pr=V/Dr

Since the kinematic viscosity and thermal diffusivity have been given in Chapters 12 and 18, we simply list recommended values for helium I.

Table 19.1. Table of recommended values of the Prandtl Number for helium I at the saturated vapor pressure.

T90 (K)	Pr	T90 (K)	Pr
2.178	0.6139	3.15	0.5382
2.180	0.7244	3.20	0.5461
2.185	0.7746	3.25	0.5545
2.190	0.7511	3.30	0.5636
2.20	0.7184	3.35	0.5732
2.25	0.6175	3.40	0.5834
2.30	0.5649	3.45	0.5940
2.35	0.5361	3.50	0.6049
2.40	0.5164	3.55	0.6162
2.45	0.5039	3.60	0.6276
2.50	0.4969	3.65	0.6393
2.55	0.4940	3.70	0.6511
2.60	0.4936	3.75	0.6630
2.65	0.4944	3.80	0.6751
2.70	0.4958	3.85	0.6875
2.75	0.4979	3.90	0.7004
2.80	0.5007	3.95	0.7142
2.85	0.5041	4.00	0.7291
2.90	0.5082	4.05	0.7456
2.95	0.5130	4.10	0.7639
3.00	0.5183	4.15	0.7839
3.05	0.5243	4.20	0.8056
3.10	0.5309