The table 2 presents the properties of vapor in equilibrium with the solid (ice I) at temperatures below 0°C. The vapor pressure of ice between 0 and – 80°C can be described, with an uncertainty of less than 0.5%, by an empirical relationship proposed by , in which pressure p is in pascals and T is in kelvins:ln (p /pt) = a [1–(T /Tt)–1.5] + b [1–(T /Tt)–1.25]
with pt = 611.657 Pa; Tt = 273.16 K; a =–13.9281690...
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