# Notes: Humidity Power Point

## Notes: Humidity Name ____________________

I.

Humidity is a measure of

: ________________________________________________________________. How is water added to the air? ___________________________

II. Relative Humidity is:

____________________________________________ compared to _________________________________________________________________________________________. 1.

2.

3.

4.

Questions:

If air is holding

HALF

the water that it can hold, what is its relative humidity? ________% If air is holding ALL the water it can hold, the air is

saturated,

what’s the relative humidity? _____% If

air is holding no water at all

, what is its relative humidity? ________% If air is holding a

quarter

of the water that it can hold, what is its

relative humidity

? _________% III. If air is

saturated

, it is: _________________________________________________________________. -

Warm air EXPANDS

and

can hold more water vapor

than __________ air, so

it takes more water to saturate warm air

. If air is

saturated

, what is the relative humidity? ______________% What will most likely occur when

air is saturated and the temperature drops

? _________________

IV. Factors that Affect Relative Humidity

1.

______________________: If you

increase the amount of water

in the air,

Relative humidity

will ________________________ 2.

______________________: If you

lower the temperature

, relative humidity will ____________. Which can hold more moisture? Warm or cool air?

V. Measuring Humidity

1. Relative humidity is measured using a ___________________________. It is

.

One thermometer is dry the other one is covered with a wet cloth

. When air moves over the wet cloth,

evaporation occurs and lowers the temperature on the wet thermometer

. If you

compare the temperature

on the two thermometers you can get the

relative humidity

.

Psychrometer

VI. Condensation is:

A process by which

__________________________________________________________________________

Condensation

will occur when the air is ___________________, or has a relative humidity of ______%. The air can’t hold any more water vapor, so the water condensed out of the air. This commonly happens when

moist air is cooled

, or

comes in contact with a cool surface

.

VII. Dew Point is

the ___________________ at which____________________ will occur. It is the

temperature

the air must be in order to be ______________________.

Which can hold more moisture? (warm or cool air) ___________ VIII. Cloud Formation:

Clouds form when water vapor condenses on ________________________________.

Condensation nuclei

are ___________________________________________________________________ Examples: Dust, ash, pollutants, pollen, and soot

A.

Cirrus Clouds- B.

Cumulus Clouds- C.

Stratus Clouds- D. Cumulonimbus Clouds-

**Remember

as altitude increases

in the

troposphere

,

temperature

______________ &

condensation

occurs. ***

All weather occurs

in the ________________________ layer.