Water vapor is water in its gas form that cannot be seen. Humidity refers to the level of moisture in the air, while relative humidity compares the actual moisture to the maximum amount the air can hold. Transpiration is the process where water vapor passes through plant membranes or pores. Thermal and convection currents cause warm air to rise, often cooling and forming clouds. Meteorologists study the atmosphere including weather and climate conditions.

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

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. dew point – point when the air is completely saturated with moisture and can hold no more.

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

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

8. cloud formation – the way clouds form

9. cloud formation – the way clouds form

10. cloud formation – the way clouds form

11. cloud formation – the way clouds form

12. cloud formation – the way clouds form

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

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

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

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