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

doi:10.1063/1.471869

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

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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, Δ_i^aG (150 K) = 1100±100 J/mol, which, together with the known enthalpy difference and heat capacity data, suggests a residual entropy difference of Δ_i^aS (0) = -0.7±2.2 J/(K mol) at absolute zero. Previous theoretical estimates of Δ_i^aS (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 language	English (US)
Pages (from-to)	240-244
Number of pages	5
Journal	Journal of Chemical Physics
Volume	105
Issue number	1
DOIs	https://doi.org/10.1063/1.471869
State	Published - 1996

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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

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.",

author = "Speedy, {Robin J.} and Debenedetti, {Pablo G.} and Smith, {R. Scott} and C. Huang and Kay, {Bruce D.}",

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T1 - The evaporation rate, free energy, and entropy of amorphous water at 150 K

AU - Speedy, Robin J.

AU - Debenedetti, Pablo G.

AU - Smith, R. Scott

AU - Huang, C.

AU - Kay, Bruce D.

PY - 1996

Y1 - 1996

N2 - 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.

AB - 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.

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

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