Harwood Model:
1) Defined the problem
2) Communicated with others
3) Made observations
4) Communicated with others
5) Developed hypothesis
Materials:
Our goal is to see which of three candles burn the most. The candle in dry air and two in moist air. We are placing one candle in open air, the other two candles in water. We believe that the candle in open air will burn the most and lose the most in weight and height.
Our materials are three candles of similar heights and weights, water, glass beakers. We weighed, took the volume, and the height of each candle.
Candle 1 - V: 1/2 cups, W: 50.35 grams, H: 5.3 cm
Candle 2 - V: 1/2 cups, W: 50.2 grams, H: 5.0 cm
Candle 3 -V: 1/2 cups, W: 50.35 grams, H: 4.7 cm
Experiment:
We set up the experiment by first weighing, measuring and taking the volume of the three main candles. We then labeled each of our experiment candles. We set up the candle 1 on a paper plate, candle 2 and candle 3 were setup like this: three glass beaker were set around a small candle, candle 2 and 3 we set up in large beakers filled with water (candle 2 was set in 100 ml of water and candle 3 was set up in 200 ml of water), the large beakers were then set up on the smaller beakers with the candles (see pic).
After the set up was complete we lit the bottom candles under the large beakers and then lit all three experiment candles. We set a timer and burned the candles for 20 minutes. We discarded the melted wax. We then weighed, measured and took the volume of the experiment candles to review our results.Results of Experiment:
After burning for 20 minutes.
Candle 1 - V: 1/2 cups, W: 47.8 grams, H: 4.7 cm
Candle 1 lost 4.52 grams and lost 0.6 cm in
height.
Candle 2 - V: 1/2 cups, W: 50.2 grams, H: 5.0 cm
Candle 2 lost 3.2 grams and lost 0.8 cm in height.
Candle 3 -V: 1/2 cups, W: 50.35 grams, H: 4.7 cm
Candle 3 lost 0.79 grams and lost 0.5 cm in height.
When looking at the results of our experiment, it would seem that Candle 1 (which was in open air) lost the most in grams, while all of the candles lost about the same in height from 0.5 - 0.8 cm. It seems to fits our hypothesis.
Discrepancies in Experiment:
While our results seem to fit our hypothesis we need to make a few other observations. When we were burning Candles 2 & 3 the candle we were using to heat the water under the beaker melted the bottom of the candles. It caused a problem with Candle 3 as it melted the the candle and caused it to spill out and skewed our results. The bottom of Candle 2 was also melted and affected the results. To help with this we moved the warming candle to the edge of the glass at 10 minutes into the experiment to prevent Candle 2 & 3 from completely melting.
Improving the Experiment:
If we were to try this experiment again we would use a humidifier instead of trying to create our own humidity.
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