🔍 Key Concepts

• Dew point: the temperature at which air becomes saturated with water vapor • Relationship between rising air, cooling, and condensation in the atmosphere • Difference between fog, clouds, and humidity

💭 Think About

• When air reaches the dew point, what change happens to the water vapor in that air—does it stay invisible or begin to change state? • Is fog a type of cloud at the surface, or is it caused mainly by horizontal movement (advection) alone? • If air is saturated at the dew point, would you expect the relative humidity to go up, down, or reach a maximum?

✅ Before You Answer

• Be clear on the definition of dew point and saturation • Decide what physical process happens when water vapor begins to condense in rising air • Check which option best describes the first result of reaching dew point, not a secondary weather effect like stronger winds