1. Problem How does the density of different woods affect how long the wood can burn?

2. Hypothesis If the wood is heavy then it will burn longer because of the woods density.

3. 1.5 different types of wood 2.Barbeque grill 3.Stopwatch 4. Postal scale 5. Handsaw Materials

4. Procedure 1.Gather five different types of wood and cut them with the handsaw into four pieces (3in. by.5in. by 1in.). 2.Weigh the wood (oz.) on scale and record weight in data table. 3.Warm up barbeque to 550 F then place the wood on the grill and start timer. 4.After fifteen minutes take the wood off of the grill and weigh them (oz.). 5.Take wood back out to the grill and burn them until gone. 6.Repeat steps 2-5.

5. Manipulated Variable: Type of wood. Responding Variable: How long the wood burns. Controlled Variable: How long the wood is in the barbeque grill (20 min.) and the amount of each wood. Variables

6. Data table: Heat Efficiency Type of wood1.25 Starting Weight (oz.) Ending weight (oz.) Trial 1 Ending weight (oz.) Trial 2 Alder.75.2.1 Douglas Fir1.2.1 Madroña1.25ashes.1 Elm1.25ashes0 Oak1.25.4.25

7. Conclusion In conclusion, I wanted to know the density of the wood affects how long the wood can burn. My hypothesis was, if the wood is heavy then it will burn longer because of the woods density. In the first trial I noticed that after fifteen minutes the Douglas Fir wood had expanded. The Madroña and Elm had become ashes and that the Oak and Alder were the most intacted. In the second trial the Madroña, Douglas fir and the Alder were all the same ending weight.1 oz. The Elm’s weight was zero and the Oak lasted the longest weighing in at.25 oz. In this experiment I learned that, the Oak would be the most efficient wood for house burning because at the end of fifteen minutes it weighed the most out of all five woods. The madroña and Elm would be the worst for burning because at the end of fifteen minutes they were ashes or didn’t weigh more that.1 oz. Next time I will add more wood and make the wood pieces bigger.

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