Method
- Obtain four balloons of equal size, shape and colour.
- Inflate all balloons to approximately the same size (diameter of 40 cm). Use a measuring tape to ensure the diameter is approximately 40 cm for each balloon.
- Place the first balloon in the refrigerator at 0°C and leave it for three hours. Make sure the refrigerator door remains shut for all three hours, to restrict the amount of warm air flowing inside.
- Place the second balloon in a heated room at 25°C for three hours. Ensure that all doors and windows are shut at all times, to control the amount of cool air flowing inside the room.
- Tie the third balloon to a fan and leave the fan on for three hours.
- Place the fourth balloon in a bucket, with a constant stream of water above it, and leave this for three hours also.
- Retrieve all the balloons from their respective places after three hours, and observe any changes i.e. difference in size, shape, rate of deflation.
- Record all observations.
- Repeat steps 1-8.
- Obtain a white balloon and a black balloon.
- Place both balloons under direct sunlight for three hours. Ensure that they stay in the sun, and do not become shaded.
- Collect both balloons after three hours and observe any changes i.e. size and shape.
- Record all observations.
- Repeat steps 10-13.
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