The Prandtl number of water as a function of 
temperature.

Sample data file, CurveExpert 1.0

T(F)  Pr
========================================
32   13.7
40   11.6 
50   9.55 
60   8.03 
70   6.82 
80   5.89 
90   5.13 
100  4.52 
150  2.74 
200  1.88 
250  1.45 
300  1.18 
350  1.02 
400  .927
450  .876
500  .87 
550  .93
600  1.09