Anomalous Components of Supercooled Water Expansivity, Compressibility and Heat Capacity (C sub p and C sub v) from Binary Formamide + Water Solution Studies.
Abstract
Following earlier use of binary solution studies to estimate anomalous and normal components of the total heat capacity of supercooled water, we have extended this type of study to the system water + formamide, and included the additional properties expansivity and compressibility. The excess, or anomalous, expansivities and heat capacities of pure water assessed from this study fit critical point equations with singular temperatures close to those assessed in earlier studies. The compressibility, however, yields a 'normal' component which is large compared with that estimated from ethanol-water solutions and leads to very poor fits to critical point equations. The source of this discrepancy is discussed. Combining all results, we have obtained a plot of C(v) for binary solutions at different temperatures, and thereby have estimated an anomalous component for the constant volume heat capacity. In contrast to the constant pressure heat capacity, which diverges, the constant volume anomalous component behaves like a Shottky anomaly. In this respect an analogy with the adiabatic compressibility may be noted. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1982
- Accession Number
- ADA111339
Entities
People
- C. A. Angell
- M. Oguni
Organizations
- Purdue University