Vapor pressure formulation for ice

A new fonn ulation is presenl ed for Ih e vapor press ure of ice from Ihe triple point to -100C based on thermodynamic calculations. Use is made of Ih e d efinilive ex pe rim e nlal value of the vapor pressure of waler a t its triple poinl recentl y oblain ed by Cuildner , Johnson, and Jones. A tab le is given of Ihe vapor press ure as a function of le mpe rature at O.I-d egree inl e rv a ls ove r Ihe range 0 10 -100 C, logel he r wilh Ihe values of Ih e lemperature derivative at I-degree inl e rvals . T he formu laLion is compa red with published ex perime nlal meas urement s and vapor pressure equaLi ons. It is eslima led Ih at Ihi s formu lalion predi cls Ihe vapor pressure of ice wit h an ove rall unce rtainl y Ihal vari es from 0.016 pe rce nl al the Iripl e poinl 10 0.50 percenl a l -100 C. K ey wo rd s: C lausius-C lapey ron equation; sa turation vapor press ure over ice; th e rm a l properti es of ice; vapor pressure; vapor pressure at th e triple point; vapor pressure of ice; waler vapor. Pa Pa c m 3 / g c m 3 /g c m 3 /c m 3 Pa cm 3 /cm 3 Pa J/gK J/gK