🔍 Key Concepts

• Dew point as the temperature at which air becomes saturated with water vapor • Difference between absolute humidity (actual water vapor content) and relative humidity (how full the air is compared to its maximum capacity) • What it means for air to be saturated with moisture at a given temperature and pressure

💭 Think About

• If air is at its dew point with no temperature or pressure change, what does that tell you about how much more water vapor it can hold? • Think about what happens when you cool moist air to its dew point – does condensation start because the air is already full, or because it is still relatively dry? • Which of the options describes air that is already at its maximum moisture capacity for that temperature and pressure?

✅ Before You Answer

• Verify the definition of dew point: it is reached when air becomes saturated with water vapor • Check which choice best matches the idea of saturated air (air holding all the moisture it can at that temperature and pressure) • Eliminate any option that suggests the air is far from saturation, such as very low relative humidity or being able to hold a lot more moisture