This document discusses key concepts about water vapor and humidity in the atmosphere including relative humidity, transpiration, cloud formation, thermal convection, and the role of meteorologists. It explains that relative humidity compares the actual water vapor in the air to the maximum it could hold, that transpiration is how plants release water vapor, and that cloud formation results from thermal convection raising warm air which cools and condenses into clouds.

1. Chapter 10, Lesson 4 Water Vapor and Humidity water vapor humidity relative humidity transpiration cloud formation thermal convection meteorologist

2. water vapor - water in its gas form is water vapor. If you can see it, it’s not really water vapor!

3. humidity – the level of moisture in the air; the amount of water vapor in the air

4. relative humidity – is when you compare how much water vapor is in the air to how much it COULD hold

5. transpiration –watery vapor passed through a membrane or pores in a plant

6. transpiration –watery vapor passed through a membrane or pores in a plant

7. cloud formation – the way clouds form

8. cloud formation – the way clouds form

9. cloud formation – the way clouds form

10. cloud formation – the way clouds form

11. thermal – a rising air current caused by heating the Earth’s surface (radiation)

12. thermal – heated air that rises thermals help these birds to soar, they help gliders soar, too. They push air into the atmosphere, that cools and forms clouds

13. convection – when relatively warm air is raised into the atmosphere, often cooling and forming clouds

14. meteorologist – a scientist who deals with the atmosphere, including weather and climate