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E.T. 2/25 Draw the following (beach, water, and sun) in the

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E.T. 2/25 Draw the following (beach, water, and sun) in the notes section of your science notebook * * * * * * * Make an analogy and write it down Your job is ... – PowerPoint PPT presentation

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Title: E.T. 2/25 Draw the following (beach, water, and sun) in the


1
E.T. 2/25Draw the following (beach, water, and
sun) in the notes section of your science
notebook
2
THE STORY OF MR. SEABREEZEWhy we have weather
  • Imagine yourself at the beach during the day and
    then at sunset -- what, if any, differences are
    there?

3
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.

4
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?
  • .

5
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

6
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

7
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?

8
  • The same principle is true of hot or cold air in
    the atmosphere
  • -Warm air rises
  • - Cold air sinks

9
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

10
  • http//www.classzone.com/books/earth_science/terc/
    content/visualizations/es1903/es1903page01.cfm?cha
    pter_novisualization

11
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12
Sea Breeze
13
  • 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

14
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.

15
Entry Task 2/11/09Discuss with classmates
  • How does an airplane wing work in terms of air
    pressure?

16
  • When it is cold and you exhale, why do you see
    your breath? Why does this not happen when it is
    warmer?

17
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18
About how much water vapor can the air hold if it
is zero degrees outside? What if it is 40 degrees?
19
Dew point
  • Why does dew form on the ground?

20
Dew point
  • Why does dew form on the ground?

21
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.

22
Discussion of Questions
23
Entry Task
  • What conditions are necessary for clouds to form?

24
Cloud in a bottle LAB (put this title in
textbook)
  • Investigative question What conditions are
    necessary for clouds to form?
  • Hyposthesis (if, then, because)

25
  • Make data table to record observations of three
    trials.

26
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

27
  • PART B
  • Fill jar 1/3 full of warm water
  • Strike match and drop into water
  • Immediately put ice (in metal can) on top of
    bottle
  • Make observations of what is happening in your
    textbook while shining flashlight through empty
    space in jar

28
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?

29
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.

30
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.

31
Evaporative cooling
  • Demonstration

32
  • http//www.colorado.edu/physics/2000/bec/evap_cool
    .html

33
What is temperature measuring?
  • Definition of temperature The average kinetic
    energy of molecules in a substance

34
Make an analogy and write it down
  • Your job is to make an analogy for the process of
    evaporative cooling.

35
  • 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.
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