SG of Water -errata

[Brian Whatcott <inet@INTELLISYS.NET>]

At 10:16 PM 12/1/01,  I wrote:
>  ...the thermal
> cubic expansivity of liquid water, which is 2.1E-4 per Kelvin above 4 degC
> and a similar negative quantity between 0 and 4 degC.
>   The relative density of ice is 0.92 which represents the step increase of
> volume at freezing ...


You may notice that the expansivity I gave (from a databook) does not in fact
agree with the relative density of water at 100 degC that Bernard C gave,
namely
0.96.
I *should* have reported that a databook shows the expansivity of water
** AT 20degC **
   is 2.1E-4 per Kelvin. This property is not however, linear.

I referred to the 54th edition of the Rubber book for this table (excerpted)

Degassed air
Temp degC                    relative density cf water at 3.98degC = 1.000
0                                    0.917            (ice)
0                                   0.99987         (liquid water)
3.98                               1.00000
10                                  0.99973
20                                  0.99823
30                                  0.99567
40                                  0.99224
50                   0.98807
60                                  0.98324
70                                  0.97781
80                                  0.97183
90                                  0.96534
100                                0.95838

Sorry about that!


Brian Whatcott
  Altus OK                      Eureka!