Students will demonstrate the power of solar energy by completing a variety of activities, including the create of a Pizza Box Solar Oven.
Who's Blowing Up the Balloons?
- Two plastic bottles, one
painted white, I painted
- Two balloons
Making a Pizza Box Solar Oven
- Pizza box
- Black construction
- Aluminum foil
- Clear plastic sheet
(clear plastic window
- Non-toxic glue
- Pencil, or string
Making a Pizza Box Solar Oven
- Plastic wrap
- Corn chips
- Shredded cheese
Launching a Solar Hot Air Balloon
- Amazing Sun Fun Activities, by Michael Daley (Learning Triangle
Press); ISBN 0-07-015177-6
- How Grandmother Spider Stole the Sun, Keepers of the Earth, by
Michael J. Caduto and Joseph Bruchac; ISBN 1-55591-027-0
- Crow Steals Some Daylight, Life in Polar Lands, by Monica Byles;
Background for Teachers
NASA Web site: "Our Sun"
"The sun gives us heat, light, our food, and the air that we breathe. It
powers the atmosphere to give us the winds and rain. Even the coal and
oil that generate electricity for light and power come from plants and
animals that lived hundreds of millions of years ago and depended on the
Sun for life."
"The sun heats the land, oceans, and air. It evaporates water from
lakes and oceans. When the water vapor cools, it drops as rain or snow
giving us the moisture we need for drinking water and for plants and
animals to grow."
"Green plants use the Sun's rays to turn carbon dioxide and water
into carbohydrates. At the same time, they release oxygen that we use to
breathe. This process of production of carbohydrates by green plants is
called photosynthesis. The carbohydrates formed by plants are used by
them to grow and we use plants for our food. Without the Sun, Earth
would be a dark, cold, dead place."
The invitation to learn activity refers to the story of Thumbelina,
which could be read previously during a reading period. The bottle
activity demonstrates that energy from the sun can be collected and
stored. White bottles reflect most of the sun's energy. Black bottles
absorb the sun's energy better. As the black bottle absorbs energy, the air
inside the bottle warms up and expands filling the balloon with air.
Making a Pizza Box Solar Oven is an engaging project for students
because it shows that sunlight is a source of energy, and demonstrates the
use of insulation in trapping heat. This is combined with something
students really enjoy: making something good to eat. Solar ovens can
reach temperature of 200-275 degrees, hot enough to cook food. When
cooking in a solar oven, get the food in early and don't worry about
overcooking. The cooking time will be at least twice as long as
conventional methods. Allow about 1/2 hour to preheat.
Ingredients: tortillas, shredded cheese, black beans, shredded
- Lay a tortilla on the tray. Cover 1/2 with cheese and 1/2 with
- When the cheese looks melted and the beans are warm, spoon
on lettuce and salsa, fold over, and eat.
Ingredients: English muffins or pita bread, pizza sauce, shredded
cheese, other toppings (sliced very thin), olives, mushrooms,
- Split the muffin or pita pocket in half. Spread on a thin layer
of pizza sauce.
- Put on three pieces of topping and sprinkle a thin layer of
- When the cheese looks melted, enjoy.
While the food is cooking in their solar ovens, use the Solar Hot Air
Balloon to visually demonstrate the power of solar energy. Within a few
minutes the black balloon will collect enough energy to heat up the air
inside the balloon enabling it to float by itself. Caution: Handle the
balloon carefully or it may get away and get caught in voltage power
lines, etc. (The Solar Hot Air Balloon is smaller, 10' x 2', less expensive,
and easier to manage with students than a Solar Bag 50' x 2'.)
Tips for improving your solar oven
- Use a pizza box made from corrugated cardboard, as the trapped
air in corrugated cardboard will help your solar oven heat up
better than a thin cardboard pizza box.
- Tape over any air leaks around the edges of the pizza box,
however make sure that the box can still be opened.
- Use a dark metal pan or pizza tray inside your pizza box over the
black paper. The dark metal absorbs solar energy and heats up
hotter than black paper by itself.
- Add a sheet of plastic to the top of the lid opening. This will
create a layer of air as insulation between two sheets of plastic
and will keep heat in the box. Be sure the plastic is tight and
- Use foil covered cardboard to add extra flaps to increase the gain
of your oven.
Note: Arrange for parent helpers during the class period in which
you are measuring and making your flaps to ensure that
students with special needs have a successful experience.
- Crumble 1 to 1 1/2 inches of newspaper and stuff it around the
inside edges of the box for additional insulation.
- Set the oven on blacktop, brick, or cement, close to the south side
of a building. Keep it out of the wind. Tilt the oven a little to get
rid of the shadows cast by the edges of the box.
- Solar cooking takes time, and the sun will change position during
cooking time. You may need to realign the solar oven now and
then to keep the most sunlight entering the oven.
Intended Learning Outcomes
1: Use Science Process and Thinking Skills
2: Manifest Scientific Attitudes and Interests
3: Understand Science Concepts and Principles
Invitation to Learn
Who's blowing up the balloons?
As an introduction to this unit, recall the story of Thumbelina.
Why did the old mouse recommend that Thumbelina marry the mole?
What were some of the reasons that Thumbelina was so unhappy in the
mole's dark home? Why would you be happier in the warmth of the
sun or than in a dark cold hole? People need the sun for many reasons.
List them. Students will recommend, "Don't marry the mole!"
You will need two plastic bottles, one painted black and one painted
white. Place the open end of a small balloon over the mouth of each
bottle. Make sure the balloon forms an air tight seal. Place both bottles
with balloons in bright sunlight.
Discuss: What do you think is going to happen? Why?
Within a few minutes, you will notice the balloon on the black bottle
will start to expand. The white balloon will remain limp.
Discuss: Why do you think the balloon on the black bottle
Touch the black bottle. Is it warm? Touch the white bottle. Is it
cooler? Does a black object get warmer in the sunlight than a white
object? What would be a good color to wear when playing tennis in the
summer? What would be a good color to paint your car for staying
cooler in summer?
Making a Pizza Box Solar Oven
Discuss: Can the sun cook our food?
Make pizza box solar ovens and try it.
- Tape foil to the inside bottom of the pizza box, shiny side up.
This will create a trap to hold heat that is radiated from food and
air inside the box.
- Cover the foil with black construction paper (you do not need to
go up the sides of the box). This will help absorb the incoming
- Close the box. On the top, measure and mark 1 1/2 inches from
the edge, in several places. Draw a line connecting your marks
and outlining the flap. Decide where the hinge of the flap will be
and write "Flap, Do Not Cut!"
- Cut along the front and two sides to make the flap. (Work
carefully especially around the corners. Remember not to cut
along the line that will be the hinge for the flap. It may help to
get adult help using an X-ACTO® knife instead of scissors.)
- Place your ruler along the line that marks the hinge of the flap.
Carefully pry the flap open. Make the fold for the hinge
carefully. (It helps to do this with a partner.)
- Cut a piece of foil the size of the flap. Glue it to the side of the
flap that faces into the box, shiny side up. (Flatten out all
wrinkles and be sure to wipe off any glue smears with a damp
- Put the box on the plastic. Draw an outline of the box on the
plastic with a marker. Cut the plastic about 1/4 of an inch inside
of the outline.
- Open the box and tape the plastic to the inside of the top of the
box. Tape one side and then the other. Try to make it tight and
smooth. Seal it all around so that warm air cannot escape from
the oven interior. Close the box and open the flap.
- Your pizza box solar oven is ready to use. Make Nachos!
Ingredients: corn chips, shredded cheese, salsa
- Put a single layer of chips on plastic wrap. Sprinkle on the
- When the cheese looks melted, dip nachos in salsa.
- Aim the oven at the sun. Adjust the flap to reflect the most
sunlight into the oven. You can tell the flap is adjusted
correctly by looking at the sun's reflection inside of the oven.
Use pencil, ruler, or string to hold the flap at the best angle.
Caution: Never look directly into the sun. You could damage your
- Place a thermometer inside the oven to measure the temperature.
- Write in your science journal telling what you learned doing this
project, what you liked about this project, and what you'd do
differently if you were to make a new solar oven.
Launching a Solar Hot Air Balloon
While the food is cooking in the solar ovens, launch the Solar Hot
Air Balloon. The balloon will visually demonstrate the power of solar
- Fill the balloon with air. Tie the balloon.
- Add a long cord students have marked off in ten centimeter or one
foot increments so that elevation can be measured.
- As the black balloon is allowed to sit in the sun, it will heat up
and begin to rise.
- Start timing as soon as the balloon begins to rise. Record the
elevation every minute. Use Solar Balloon handout to
graph your results. You could also calculate the rate of change in
Rate = Total Elevation divided by Time
Discussion questions: Why did the balloon begin to rise? Did it rise
at a constant rate? What is the temperature of the air outside the
bag? Bring the bag back down and lay a thermometer on the bag.
What is the temperature of the outside of the bag?
Question: “What happens to molecules when they are heated?
Heat is a form of energy. As water, air, and other substances increase
in temperature, their molecules start to get more energy. As those
molecules move faster they bump into each other and take up more room.
- Use masking tape to create a circle (or make an outline of a
- Tell students they are going to be playing the part of water
- First, they will represent a frozen pot of water. Have students
crowd into the pot and stand still. There should be room for all
students to stand comfortably. You may choose to make a pot for
- Next, tell students you are going to turn the stove on and start
heating up the pot of ice. They are to start moving slowly.
Everyone should keep moving but they should not push or shove
and they should stay within the circle.
- Now the ice is all melted and the water is starting to warm up.
The students should move a little faster. They should still avoid
bumping into each other and try to stay within the circle.
- Now the water is boiling, steam is starting to rise out of the pot.
The students should move faster and faster until they can no
longer stay within the lines of the pot. (Students could do various
exercises that require more and more space, e.g., jumping up and
down, jumping jacks, jumping side to side, etc.)
- Discuss with students how this activity relates to the movement of
molecules as they are heated, and the connection of sunlight as
the energy source.
- Read folktales about the sun.
- Assign, edit, and publish student-written folktales about the sun.
- Make and use solar hot dog cookers made from foil-covered
round oatmeal boxes cut in half lengthwise. Share your
experience with the class.
- Students modify and enhance your solar ovens at home and get
them ready for a class solar cook-off.
Cook-off question: Which oven can produce the greatest water
temperature increase in 60 minutes?
Share your solar oven with your family by cooking a family treat
in the oven. Share your recipe with your class.
- Fill pie plates with two cups water at room temperature, place
in solar ovens with a thermometer.
- Record temperatures every ten minutes for 60 minutes.
- Do you have a winner or is there a tie?
- Edit and publish student folktales.
- Note student’s measurements of the flap for the solar oven, assess
and assist with mathematics measurement skills.
- Check student’s chart and graph of solar balloon activity.
- Check student’s Science Journals for understanding that the sun is
the main source of heat and light for earth.