Water Vapor Pressures Temperature = 100 F Highland Wexler 1983b (-148 F to 32 F)= Highland Wexler (32 F to 392 F)= 1.93485419 inches Hg Keenan & Keys 12 (50 F - 302 F)= 1.93010279 inches Hg Keenan & Keys 11 (122 F - 705.398 F) =