OCR Text |
Show Always Water 'Pater Pater ' Vapor in m Air AirThere AirThere AirThere There is always water vapor pres pres- present pres- pres present present - - ent in air , but the amount varICS varies varICSover variesover variesover over a wide range according accordmg to tothe tothe tothe the weather It may be as low lowas lowas lowas as .1 1 . per cent on a bitterly cold coldclear , clear day on the northern plains plainsor , or as high as 5 per cent on a asteammg asteaming asteaming steammg steaming day in 111 the tropics . |