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Investigating the Heating and Cooling Rates of Soil and Water Lab

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Did you know that the earth's surfaces heat and cool differently? In this lesson, you will investigate the rates at which soil and water heat and cool. – PowerPoint PPT presentation

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Title: Investigating the Heating and Cooling Rates of Soil and Water Lab


1
Investigating the Heating and Cooling Rates of
Soil and Water Lab
  • Lesson 3 Inquiry 3.1

2
  • Heating Earths Surfaces

Have you ever walked barefoot on a sidewalk in
the early summer? The concrete probably felt hot
against your feet. But if you jumped into a pool
on the same day, you might have felt cold. How
could this be? Part of the explanation has to do
with the way the earth's surfaces receive and
give off heat. All the surfaces on the earth
absorb some of the sun's energy and give off heat
to the air as they coolbut they do it at
different rates. Did you know that the earth's
surfaces heat and cool differently? In this
lesson, you will investigate the rates at which
soil and water heat and cool. In later lessons,
you will see that this uneven heating affects the
circulation of air on the earth and helps create
storms.
Hot concrete and cool water are signs that the
earth's surfaces heat and cool at different rates.
3
Earth's Surfaces
  • Big Question
  • What is the difference in the heating and cooling
    rates of soil and water?
  • Hypothesis
  • What do you think will happen to the temperature
    of the soil and the water when you turn on the
    lamp? What will happen to their temperatures
    when you turn off the lamp? Why do you think
    this? (When you answer these questions you will
    have written your hypothesis for this lab
    experiment.)
  • I think the temperature of the soil and water
    will ___________ when I turn on the lamp because
    _________. When I turn off the lamp the
    temperature of the soil and water will __________
    because __________.

4
Materials and Constants
  • How will you make certain that your investigation
    of the heating and cooling of soil and water will
    be a fair test? Record all the things that you
    will need to keep the same in both setups. You
    may draw a picture here and label it. (Under
    your hypothesis write the title Materials and
    Constants. This is where you will record the
    materials used in the lab, and the things that
    you will keep the same for both setups.)
  • Materials soil, water, digital thermometers,
    beakers, heat lamp
  • Things we will keep the same - equal amounts
    of soil and water - both thermometers set to
    Celsius- both thermometers at the same depth-
    soil and water equal distance from heat lamp-
    soil and water must be under heat lamp the same
    amount of time

5
Figure 3.1
  • Soil and Water setup

6
Procedure
  • Measure exactly 100ml of water and 100ml of soil.
    (Do not pack soil.)
  • Put one thermometer in each beaker up to the
    taped line.
  • Turn on thermometers and take beginning
    temperature. This may take a couple of minutes
    until the temperature reading no longer shows any
    sign of changing.
  • When the reading stabilizes, record the first
    temperature on your table next to the time 000.

7
  • Put the beakers under the lamp 30 cm from the
    bookends. Turn on the lamp start the stopwatch!
  • Important DO NOT PUT THE BEAKERS DIRECTLY UNDER
    THE LAMP!
  • Record the temperature of both the soil and water
    every minute for ten minutes. Do not stop the
    stopwatch in between readings.
  • BLUE READ SOIL TEMPERATURE
  • RED READ WATER TEMPERATURE
  • YELLOW WATCH THE STOPWATCH
  • GREEN RECORD TEMPERATURES ON TABLE

8
  1. As soon as you record the temperature for 1000,
    turn off lamp and DO NOT stop the stopwatch.
  2. Record the same temperature for ten minutes in
    both the heating and cooling column of table.
    (SEE TABLE HIGHLIGHT).
  3. Record the temperature of the cooling water and
    soil every minute for ten minutes. Record
    temperatures on table.
  4. After recording the temperature at time 2000, as
    a group figure out the total temperature change
    for both the heating and cooling of the water and
    soil.

9
Questions before we begin
  • Look at Table 3.1a
  • What do the numbers in the first column of the
    table represent?
  • Which section of the table represents times in
    which the lamp is on and times when the lamp is
    off?
  • Why should you not reset the stopwatch to 0.00
    after each minute reading?
  • How can you calculate temperature change?

10
Time for the Experiment!!!Observations/Data/Resul
ts
  • Set up materials with thermometers in the soil
    and water. Red you are in charge of getting the
    water Blue is in charge of getting the soil.
  • Take the temperature reading for 000 but DO NOT
    turn on lamp yet!
  • We will all turn on the lamps and begin timing at
    the same time.

11
Conclusion
  • Restate the big question(What is the difference
    in the heating and cooling rates of soil and
    water?) The difference in the heating and
    cooling rates of soil and water ..
  • Revisit your original hypothesis(What did you
    think would happen to the temperature of the soil
    and the water when you turned on the lamp? What
    would happen to their temperatures when you
    turned off the lamp? Why did you think this? Was
    your hypothesis proven to be true or false? Why)

12
Heating and Cooling Reflection
  • How would you describe the heating and cooling
    rates of soil and water in the investigation?
  • Which material held its heat longer?
  • What factors may have influenced your results?
  • Reread the Introduction to this lesson. Can you
    explain now why concrete feels hot under your
    feet in early summer, while water in a pool feels
    cold?
  • On the basis of your investigation, how do you
    think the temperature of the ocean compares with
    the temperature of the land nearby?

13
Heating and Cooling Data Table 1
14
Graphing Your Data
  • What title will you give your graph?
  • How will you label each axis to show the
    temperature and time changes?
  • What will be the first number on each axis? How
    will you space the numbers on each axis? How
    many degrees will each interval between the
    numbers represent?
  • What techniques will you use to make the graph
    more readable?

15
Graph A
16
Graph B
17
Graph C
18
Graph D
19
SAMPLE GRAPH
Heating and Cooling Rates of Soil and Water










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