- 1 matchbox
- 1 candle
- 1 yellow colored balloon
- 1 blue colored balloon
- Half a cup of water
1. For this experiment, the independent variable is whether the balloon is filled with water or not. The dependent variable is what happens to the balloon when it is placed above the lit candle. This is determined by observing the balloon. The constants (control variables) are how much the balloon is inflated and the amount of water in the balloon.
2. Inflate the yellow colored balloon and tie it up.
3. Pour half a cup of water into the blue colored balloon before inflating it to the same size as the yellow color balloon and tie it up.
4. Light up the candle. Be careful when using match sticks to avoid causing fires, or burning yourself.
5. Hold the yellow colored balloon on top of the lit candle. Observe and record what happens.
6. Hold the blue colored balloon on top of the lit candle. Observe and record what happens.
How the Strength of a Magnet Varies with Temperature
Materials and Equipment
To do this experiment you will need the following materials and equipment:
* safety glasses,
* 5–10 permanent iron magnets of equal size and strength,
* thermometer (minimum range 0–100°C),
* tongs for holding magnets (preferably plastic, for minimizing heat transfer),
* dry ice (frozen CO2),
* water ice,
* insulated containers to hold ice and dry ice,
* thick insulated gloves for handling dry ice,
* small pot,
* stove or hot plate for heating water,
* 2 large plastic bowls,
* at least one box of standard #1 paper clips,
* if you have a really strong magnet, you may need more than one box,
* test the magnet at room temperature first, and make sure that there are plenty of paper clips left over (see Experimental Procedure, below),
* alternatives to paper clips: small... [continues]
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