Vapor pressure at 100° compared to 68° is generally higher. (True or false)

Vapor pressure at 100° compared to 68° is generally higher. (True or false)

• A. False
• B. Cannot be determined
• C. Depends on the substance
• D. True

Answer: (D)

Vapor pressure is the pressure exerted by vapor in equilibrium with a liquid at a given temperature. As temperature increases, more molecules have enough energy to overcome the forces holding them in the liquid and escape into the vapor phase. That rise in escape likelihood raises the vapor pressure. Going from a cooler temperature like 68° to a hotter one like 100° means more molecules vaporize, so the vapor pressure is higher at the hotter temperature. This is the reason heat increases volatility and the amount of vapor that can form, which is a key consideration in HazMat scenarios. While there are rare exceptions where other factors dominate, the general trend is that vapor pressure increases with temperature, so the statement is true.

Vapor pressure is the pressure exerted by vapor in equilibrium with a liquid at a given temperature. As temperature increases, more molecules have enough energy to overcome the forces holding them in the liquid and escape into the vapor phase. That rise in escape likelihood raises the vapor pressure. Going from a cooler temperature like 68° to a hotter one like 100° means more molecules vaporize, so the vapor pressure is higher at the hotter temperature. This is the reason heat increases volatility and the amount of vapor that can form, which is a key consideration in HazMat scenarios. While there are rare exceptions where other factors dominate, the general trend is that vapor pressure increases with temperature, so the statement is true.