Transcript Air Pressure and Land/Sea Breezes

Word Splash
• Particles
• Less dense
• Vibrate
spread out
heated
sinking
rise
faster
planets
Air Pressure
Ms. Twardowski
8 Green
Central Middle School
What is Air Pressure?
• Air Pressure: Is the
force/pressure exerted on
any object by the Earth’s
atmosphere.
Make TWO columns
• “L” = stands for Low
Pressure system. Warm
air rises, so there is less
pressure put on objects by
the atmosphere.
• “H” = stands for High
Pressure System. Cooler
air sinks, so there is more
pressure put on objects.
Synonyms
• Air Pressure
• Atmospheric Pressure
• Barometric Pressure (A ‘barometer’ is used to
measure air pressure)
High Pressure Systems.
• AIR/WIND ALWAYS
MOVES FROM AREAS OF
HIGH TO LOW
PRESSURE (Write this
down!!)
• Cool air sinking
• Clockwise rotation
• Clearer skies (because air
sinks and the pressure creates
friction/HE that evaporates
the moisture in the air).
Low Pressure Systems.
• Warmer Air Rising
• Moves in a counterclockwise rotation.
• Warmer temperatures.
• Clouds and precipitation
(because warm air rises
and then cools/condenses
to form clouds).
False/No = Red
True/Yes = Green
• High Pressure is associated with cool,
sinking air and clearer skies.
False/No = Red
True/Yes = Green
• Air/Wind moves from Low to High
Pressure systems.
False/No = Red
True/Yes = Green
• Atmospheric Pressure, Air Pressure, and
Barometric Pressure are synonyms.
With this movement of air – MOST
weather moves from WEST to EAST.
• WHY do you think this is?
• WHAT do you think makes
most weather move this way?
New concept: Convection Currents
(don’t copy this)
• When air is heated, the particles begin to move faster, spread
further apart and become less dense.
• As the air becomes less dense, it will begin to rise.
• As this air rises, it slowly begins to cool and the particles slow
down, come closer together and become denser and sink.
Sea Breezes
(copy AND draw this! Don’t forget the Sun!)
• A sea breeze develops when the land become much
warmer than the sea on a sunny day.
• Therefore, the air over the land is warmer, less dense
(low pressure) and begins to rise over the land.
• As this warmer air rises, it begins to cool and becomes
denser (higher pressure) and sinks.
• Air moves from high to low pressure. This process gives
you a convection cycle.
Land Breezes
(copy AND draw this! Don’t forget
the moon!)
• A land breeze develops when the land cools
down much more than the sea during the
nighttime.
Summary Questions
(What did you learn?)
Put up your red/green card!
1. Convection is when Heat
Energy moves through a
solid.
Summary Questions
(What did you learn?)
Put up your red/green card!
2. A Sea Breeze means: the
‘breeze’ is coming ‘from’
the sea.
Summary Questions
(What did you learn?)
Put up your red/green card!
3. Air/Wind always moves
from HIGH to LOW
pressure.
Summary Questions
(What did you learn?)
Put up your red/green card!
4. Land Breezes happen
during the night.
Summary Questions
(What did you learn?)
Put up your red/green card!
5. Land Breezes happen
during the night.
Summary Questions
(What did you learn?)
1. Take out a sheet of blank
notebook paper.
2. Put a heading on the paper.
3. Number your paper from 110.
Summary Questions
(True or False)
1. Warm air rises.
Summary Questions
(True or False)
2. Low pressure systems are
associated with cloudy
weather and precipitation.
Summary Questions
(True or False)
3. Air flow counter-clockwise
around a LOW pressure
system.
Summary Questions
(True or False)
4. Low pressure systems are
associated with WARMER
temperatures.
Summary Questions
(True or False)
5. High pressure systems are
associated with clear skies.
Summary Questions
(True or False)
6. Air flows counter-clockwise
around a high pressure
system.
Summary Questions
(True or False)
7. Cooler air sinks.
Summary Questions
(True or False)
8. Sea Breezes happen during
the day.
Summary Questions
(This sentence is false. Change
ONE word to make it true. Write
the TRUE statement on your
paper.)
9. Warm air rises because it is
more dense than the air
around it.
Summary Questions
(This sentence is false. Change
ONE word to make it true. Write
the TRUE statement on your
paper.)
10. Sea Breezes happen at night
when the ocean water is
warmer than the land.
Review: Land/Sea Breezes
(Partners)
• Draw BOTH pictures on a
sheet of paper.
• Label the pictures with:
–
–
–
–
–
–
–
Arrows
L and H (low/high pressure)
The Sun/moon
Warm air rising
Cool air sinking
Land Breeze
Sea Breeze