Chapter 10,

Lesson 4

Water

Vapor and

Humidity

water vapor

humidity

relative humidity

transpiration

cloud formation

thermal

convection

meteorologist

water vapor - water in its gas form is

water vapor. If you can see it, it’s

not really water vapor!

humidity – the level of moisture in

the air; the amount of water

vapor in the air

relative humidity – is when you

compare how much water vapor

is in the air to how much it

COULD hold

dew point – point when the air is

completely saturated with

moisture and can hold no more.

transpiration –watery vapor

passed through a membrane or

pores in a plant

transpiration –watery vapor

passed through a membrane or

pores in a plant

cloud formation – the way clouds form

cloud formation – the way clouds

form

cloud formation – the way clouds

form

cloud formation – the way clouds

form

cloud formation – the way clouds

form

thermal – a rising air current

caused by heating the Earth’s

surface (radiation)

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

convection – when relatively

warm air is raised into the

atmosphere, often cooling and

forming clouds

meteorologist – a scientist who

deals with the atmosphere,

including weather and climate