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Expansion and shrinking of woodFeatured science projectScience project video

Observation

It  was observed that  all 4 types of wood shrank the most along the growth rings (50mm). The black oak showed the biggest change in dimensions compared to the other 3 types of wood. Redwood showed the least change in dimensions.

Wood

Along the growth ring (mm)

Along the Radial (mm)

Along the length (mm)

Normal

After dry

% change

Normal

After dry

% change

Normal

After dry

% change

Redwood

50.1

48.6

3.08%

20.1

19.7

2.03%

100.2

100.1

0.10%

Teak

50.0

48.1

3.95%

20.1

19.7

2.03%

100.0

99.9

0.10%

Black oak

50.1

46.4

7.97%

20.0

19.4

3.09%

100.1

99.9

0.20%

Red maple

50.2

47.2

6.36%

20.0

19.5

2.56%

100.1

100.0

0.10%

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Complexity level:
8
Project cost ($):
90
Time required:
1 day to prepare, 1 day for the science project experiment
Material availability:
Easily found
Safety concerns:

Be careful when removing the hot wooden blocks from the oven. Use gloves to protect your hands.