"The saturation with respect to water cannot be measured much below 50 �C, so manufacturers should use one of the following expressions for calculating saturation vapour pressure relative to water at the lowest temperatures Wexler ( 1976, 1977 ), Hyland and Wexler ( 1983 ) or Sonntag ( 1994 ) and not the Goff-Gratch equation recommended in earlier WMO publications ."
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