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E.T. 2/25
Draw the following (beach, water, and sun) in the
“notes” section of your science notebook
THE STORY OF MR.
SEABREEZE
Why we have weather
Imagine yourself at the beach during the
day and then at sunset -- what, if any,
differences are there?
Radiation
 The ground and water are heated
by the sun through radiation
(electromagnetic waves primarily
in the infrared, visible, and
ultraviolet portion of the
electromagnetic spectrum).
 Add “radiation” to your picture.
Think about the following
questions; do not answer out
loud but be prepared to give an
answer if called upon:
On a sunny summer day at the beach
which is warmer, the ocean water or
the sand?
At night at the beach, after the sun has
gone down, which is warmer, the
ocean water or the sand?
Specific Heat and Heat Capacity
 Specific heat is the measure of the heat energy
required to raise the temperature of a given
amount of a substance by one degree.
 Differential heating -- this is why we
have weather!
–Sand heats up faster and cools
down faster than water with
radiation from the sun (add this to
the picture in your notebook)
–Water has a higher specific heat
than sand
Conduction
–The air touching the sand is heated
by conduction, which is when energy
is transferred by molecules slamming
into one another.
–Add “conduction” to your drawing
Think about the following
questions; do not answer out
loud but be prepared to give an
answer if called upon:
What happens when the burners are lit
on a hot air balloon?
What happens when the burners turn
off?
The same principle is true of hot
or cold air in the atmosphere:
-Warm air rises
- Cold air sinks
Convection
–As the warm air over the land warms
up, it begins to rise. As the warm air
rises, the cooler air from over the
water flows in to take its place.
–This movement of air is convection,
or molecules moving from one place
to another.
–Add “convection” to your beach
drawing
 http://www.classzone.com/books/earth_scie
nce/terc/content/visualizations/es1903/es19
03page01.cfm?chapter_no=visualization
Sea Breeze
The body of air over Olympia is low pressure
but the air in Seattle is high pressure.
Which way is the wind blowing?
1) Seattle to Olympia
2) Olympia to Seattle
Homework -- on separate sheet
of notebook paper to turn in.
Write several meaningful haikus or one long
poem using the following terms with their
relation to the formation of wind: specific heat,
conduction, convection, air pressure, electromagnetic
radiation, wind.
Entry Task 2/11/09
Discuss with classmates
How does an airplane wing work in terms of
air pressure?
When it is cold and you exhale, why do you
see your breath? Why does this not happen
when it is warmer?
About how much
water vapor can the
air hold if it is zero
degrees outside?
What if it is 40
degrees?
Dew point
Why does dew form on the ground?
Dew point
Why does dew form on the ground?
Just Dew It! -- LAB
In lab groups of two or three people, perform this
lab.
MAKE DATA TABLE AND ANSWER QUESTIONS
ON YOUR OWN SHEET OF PAPER. DO NOT
WRITE ON THE CLASS SET OF LABS.
Discussion of Questions
Entry Task
What conditions are necessary for clouds to
form?
Cloud in a bottle – LAB (put this title
in “textbook”)
Investigative question: What conditions are
necessary for clouds to form?
Hyposthesis: (if, then, because)
Make data table to record observations of
three trials.
Cloud in a bottle – LAB (put this title
in “textbook”)
PART A
 Fill jar 1/3 full of warm water
 Fill metal can with ice and place on top of
jar
 Shine flashlight through empty space in jar
 Make observations of what is happening in
your “textbook”
PART B
1) Fill jar 1/3 full of warm water
2) Strike match and drop into water
3) Immediately put ice (in metal can) on top of
bottle
4) Make observations of what is happening in your
“textbook” while shining flashlight through empty
space in jar
Questions to answer in “textbook”
1) What is another condition, besides
moisture and cool air, necessary for cloud
formation?
2) In nature how does moisture get into the
atmosphere?
3) Once in the atmosphere, why would water
vapor cool?
4) What in nature would act as the smoke
that was used in lab?
Cloud formation
(take notes in “textbook” after lab)
 Evaporation: water molecules absorb thermal
energy from the sun. High energy molecules leave
as gas.
 Gases are warmed by radiation from sun, and they
expand, rise, and cool.
 Condensation: The warm water vapor rises until it
cools to the point where it condenses around
condensation nuclei in the atmosphere.
So........
 The amount of energy in the system is
conserved:
 the energy absorbed by the molecules during
evaporation is equal to the amount of energy
released during condensation.
Evaporative cooling
Demonstration
http://www.colorado.edu/physics/2000/bec/ev
ap_cool.html
What is temperature measuring?
Definition of temperature: The average kinetic
energy of molecules in a substance
Make an analogy and write it down
Your job is to make an analogy for the
process of evaporative cooling.
Example analogy: The really good college basketball
players sometimes leave to go to the NBA, leaving
the college basketball “pool” of players less
talented.
The good players are like high energy molecules,
and the NBA would be like a cloud of gas. The
“pool” of college basketball players are like a body
of liquid which is left with lower energy molecules,
and so the average kinetic energy is lower.