What does a higher vapor pressure indicate?

• A. Slower evaporation of a liquid
• B. Faster evaporation of a liquid
• C. The liquid is denser than water
• D. Lower temperature for ignition

Answer: (B)

A higher vapor pressure is indicative of faster evaporation of a liquid. Vapor pressure refers to the pressure exerted by a vapor in equilibrium with its liquid phase at a given temperature. When the vapor pressure is high, it means that more molecules are escaping the liquid phase and moving into the vapor phase, which accelerates the evaporation process.

This characteristic is especially important in hazardous materials scenarios, where liquids with high vapor pressures can pose significant risks. The presence of higher vapor pressure substances indicates that they can evaporate quickly, potentially leading to increased exposure risks for personnel and the environment. In contrast, liquids with lower vapor pressures evaporate more slowly, thereby reducing the likelihood of harmful vapors accumulating in the atmosphere.