H2O(g). molecules. (water vapor). H2O(l). molecules. How Vapor Pressure is ... Convert 25oC to Kelvin. K = oC ... Find confined gas pressure, in atm. ... NOT all liquids have same v.p. at same temp. 0. 20. 40. 60. 80. 100. 0. 20. 40 ... (usually from atmosphere). At sea level and 20oC… ETHANOL. WATER ... The high energy.