Students will define wind chill.
Students will make a graph of the data they collect.
D. Analyze weather and changes that occur over a period
Earth Systems / Y2003.CSC.S01.G03-05.BD.L04.I04
04. Describe weather by measurable quantities such as
temperature, wind direction, wind speed, precipitation
and barometric pressure.
Earth Systems / Y2003.CSC.S01.G03-05.BD.L04.I03
03. Investigate how water changes from one state to another
(e.g., freezing, melting, condensation and evaporation).
C. Describe interactions of matter and energy throughout
the lithosphere, hydrosphere and atmosphere (e.g., water
cycle, weather and pollution).
Earth Systems / Y2003.CSC.S01.G06-08.BC.L07.I03
03. Describe the water cycle and explain the transfer
of energy between the atmosphere and hydrosphere.
Discuss the concept of wind chill. Do students feel
colder when the wind is blowing? Is there a way they
can find out what the wind chill is on a given day? (News
shows and Web sites listed below)
Have the students find whether movement of the air
or wind affects the temperature that we feel.
Prepare a pan of water with about .5 inch of room temperature
water. Lay a thermometer in the water with the ball of
the thermometer submerged. Take the temperature at the
time you put the water in and then again five minutes
Have the students make a hypothesis of what they think
Put a fan by the water so that the air from the fan
blows over the water. Wait about 20 minutes and again
check the temperature. (Be careful! Don't get the fan
or the cord of the fan wet!)
Plot the points on a graph on the board.
Students will write a summary
of the graph and then answer the questions, “How
does moving air or wind affect the temperature of the
water? What do you think
you could do to stay warm?”
Have students go to http://www.nws.noaa.gov/om/windchill to
see the chart of wind chill factor (or the teacher could
print the chart and distribute to students).
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||Heading, Title, Problem and Hypothesis
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||Materials and procedure are explained.
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||Data points were included and defined.
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||A clear conclusion that explains the results of the
procedure is given.
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||Mechanics (grammar, spelling, punctuation, etc.)
Older students might want to calculate the wind chill factor
using the information below.
Formula to calculate a Fahrenheit
T(wc) = .0817 √3.71V0.5
+ 5.81 -0.25V)(T - 91.4) + 91.4
Speed in statute miles per hour
in degrees Fahrenheit
Note: When wind speeds are below four miles per
hour, the above formulas will give you a wind chill that
is higher than the actual temperature. When wind velocities
are near zero and you are standing still, your body heat
warms the air near your body. This warm air near your body
provides some insulation from the colder environment. As
a result, it may feel warmer than the actual temperature.
Source for both formulas: The National Weather Service
Students can determine from a wind chill graph when it
would be dangerous to be outdoors.
Source for the formula: The National Weather Service