air pressure notes

```Atmosphere Notes
Video Notes
A weather ____________ is the boundary between two bodies of ____________ that have different
_______________ and humidity.
These differences depend on where the __________ is coming from on the globe.
If the warm air is stronger than the ___________ air, then this is called a warm front.
If the cold air has the upperhand, then it is a __________ front.
Notes from Presentation
Air pressure is the weight of the ______________ pushing down on the earth.
Air pressure is not the ______________ all over the world.
The three things that make air pressure vary (be different) all over the world are:
1. _____________________________
2. ____________________________
3. _____________________________
Altitude
The higher the altitude, the _______________ the pressure.
The lower the altitude, the _____________ the pressure.
Why is this true?
________________________________________________________________________________
________________________________________________________________________________
Why do your ears pop as you drive up to the mountains (higher altitude)? Why is it harder to
breathe at the top of a mountain?
This causes your ears to pop in order to _______________ the pressure between the outside and
inside of your ear. Since you are breathing ____________ molecules of oxygen, you need to breathe
___________ to bring the few molecules there are into your lungs to make up for the deficit.
Temperature
 As the temperature goes _____________, the air pressure goes ____________________.
(hot molecules are further apart- less pressure).

As the temperature goes _______________, the air pressure goes __________________.
(cold air is more dense than warm air).
Demonstration Notes:
Sketch the demo.
What happens when the balloon is placed on the bottle in cold water?
________________________________________________________________________________
________________________________________________________________________________
What happens when the balloon is placed on the bottle in hot water?
________________________________________________________________________________
________________________________________________________________________________
Humidity
 Humidity is the amount of moisture in the air.

Water vapor weighs less than __________ molecules.

As the air becomes more ________, the air pressure goes down (moist air weighs less than
dry air).

Drier air has __________ pressure because dry air weighs more than moist air, therefore it
has greater _____________.
Air Mass
 Air Mass is an extremely _____________ body of air whose temperature and moisture content
(humidity), at any given altitude (height), are fairly similar in any horizontal direction.

can cover hundreds of thousands of square miles.

there can be small _______________
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