The evaporation rate, free energy, and entropy of amorphous water at 150 K

Robin J. Speedy, Pablo G. Debenedetti, R. Scott Smith, C. Huang, Bruce D. Kay

Research output: Contribution to journalArticlepeer-review

230 Scopus citations

Abstract

Measurement of the rates of evaporation of amorphous water (a) and ice (i) near 150 K can be interpreted as giving a measure of their free energy difference, ΔiaG (150 K) = 1100±100 J/mol, which, together with the known enthalpy difference and heat capacity data, suggests a residual entropy difference of ΔiaS (0) = -0.7±2.2 J/(K mol) at absolute zero. Previous theoretical estimates of ΔiaS (0), which are much larger, did not allow the amorph to be connected with normal liquid water by a reversible thermodynamic path at atmospheric pressure. The present value allows such a connection.

Original languageEnglish (US)
Pages (from-to)240-244
Number of pages5
JournalJournal of Chemical Physics
Volume105
Issue number1
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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