Under which condition will droplets evaporate and become smaller droplets that travel farther?

• A. High temperature and low humidity
• B. Low temperature and high humidity
• C. High temperature and high humidity
• D. Low temperature and low humidity

Answer: (A)

The main idea is that evaporation of droplets speeds up when it’s hot and the air is dry. When temperature is high, the droplet’s surface has more energy for molecules to escape as vapor. If the air is also very dry (low humidity), the surrounding air can accept that vapor easily, creating a strong vapor-pressure gradient that drives rapid evaporation. As droplets lose mass, they become smaller, and smaller droplets fall more slowly through air, so they can be carried farther by wind before depositing.

In cooler conditions or with high humidity, evaporation slows down. Warm air that’s humid doesn’t dry the droplets as aggressively, so they don’t shrink as much and tend to settle sooner, traveling shorter distances.