The average annual water vapor pressure value for Vientiane Vientiane [prefecture] over the past 30 years is 29.54 kPa (kilopascals).
In city of Vientiane Vientiane [prefecture], the water vapor pressure in January is 1.74 kPa; The water vapor pressure in February is 1.87 kPa; The water vapor pressure in March is 2.14 kPa; The water vapor pressure in April is 2.55 kPa; The water vapor pressure in May is 2.89 kPa; The water vapor pressure in June is 3.01 kPa; The water vapor pressure in July is 3 kPa; The water vapor pressure in August is 3.02 kPa; The water vapor pressure in September is 2.94 kPa; The water vapor pressure in October is 2.6 kPa; The water vapor pressure in November is 2.08 kPa; The water vapor pressure in December is 1.7 kPa.
The vapour pressure of water is the pressure exerted by molecules of water vapor in gaseous form (whether pure or in a mixture with other gases such as air). The saturation vapour pressure is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state.
Address: Vientiane, Vientiane [prefecture], Laos.