What is water vapor pressure at 90 degrees Celsius? Chemistry Phases of Matter Vapor Pressure and Boiling 1 Answer BRIAN M. Jun 25, 2016 #525.8 mmHg or 0.692 atm# Answer link Related questions How are vapor pressure and boiling point related? How do you find vapor pressure given boiling point and heat of vaporization? How do atmospheric pressure and elevation affect boiling point? Why is vapor pressure reduced in a solution? Why is vapor pressure lowering a colligative property? Why does vapor pressure increase with temperature? Why is vapor pressure independent of volume? What is the boiling point of milk? Why does vapor pressure decrease when a solute is added? How is the boiling point relate to vapor pressure? See all questions in Vapor Pressure and Boiling Impact of this question 2413 views around the world You can reuse this answer Creative Commons License