Dew Point & Clouds

When vapour condenses

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Saturation vapour pressure roughly doubles every 10 °C.
• The dew point is the temperature where air becomes saturated.
• Cloud base is about 125 m per °C of gap between temperature and dew point.

Steps

1. Saturation
2. Find the dew point
3. Cloud base
4. Why rising air makes clouds
5. Warm air holds more
6. Relative humidity