Entropy Data from the NIST WebBook

The

NIST WebBook

is an excellent source of

entropy

data for water and many common

refrigerants

.
Isothermal Data for liquid Water at T = 274.0 K
NIST thermodynamic property table for liquid water at 274 Kelvin.
© 1991, 1994, 1996, 1997, 1998, 1999, 2000, 2001 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.
The

reference state

for the entropy values in the this table is saturated liquid at the triple point of water: S = 0 and U = 0, at 0.01oC and 0.6113 kPa.

Go to the NIST WebBook and convince yourself that this is the reference state.

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Ch 7, Lesson B, Page 7 - Entropy Data from the NIST WebBook