Learning Library

# How Does Wind Speed Affect a Candle Flame?

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### Materials:

• 13 candles
• Permanent marker
• Scale
• Ruler or measuring tape
• Matches
• Fan

### Procedure:

1. Label 12 candles with the numbers 1-12 by affixing a small piece of masking tape to their bottoms and writing the number on the masking tape. Leave the last candle unlabeled.
2. Weigh and measure each of the 12 candles and record their weights and heights.
3. Put the first three candles indoors in an area away from any air movement. Let the candles burn for one hour.
4. Extinguish the candles. Weigh and measure the candles again, and record your data.
5. Turn on a fan. Light the unlabeled candle, and use it to find out the closest that the candle can be to the fan without being blown out. Set the unlabeled candle aside.
6. Place candles 4-6 in the location you figured out in Step 5. This is the “maximum wind location.” Light them, and allow them to burn for exactly an hour.
7. Extinguish the candles. Weigh and measure the candles again, and record your data.
8. Measure the distance between the fan and the location used in Step 6. Place candles 7-9 twice that distance away from the fan. This location should have half the wind speed of the previous location. Light the candles, and allow them to burn for exactly an hour.
9. Extinguish the candles. Weigh and measure the candles again, and record your data.
10. Measure the distance between the fan and the location used in Step 8 (this should be four times the distance between the fan and the location used in Step 6). Place candles 7-9 twice that distance away from the fan. Light the candles, and allow them to burn for exactly an hour.
11. Extinguish the candles. Weigh and measure the candles again, and record your data.
12. Find the average changes in height and weight for each group of candles. Compare these averages, charting them as needed.
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