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Humidity and its effect on various species of woodFeatured science projectScience project video


It is observed the all 4 types of wood showed significant shrinkage along their growth rings after they were dried in the oven. The biggest change was in the black oak wood and the least change in dimensions was observed in the redwood.

Wood Along the growth ring (mm) Along the Radial (mm) Along the length (mm)
  Normal After oven dry % change Normal After oven dry % change Normal After oven dry % change
Redwood 20.1 19.4 3.48% 10.1 9.8 2.97% 50 49.9 0.20%
Teak 20 19.1 4.50% 10.1 9.7 3.96% 50 49.9 0.20%
Black oak 20.1 18.4 8.46% 10 9.2 8.00% 50.1 49.9 0.40%
Red maple 20.2 18.7 7.43% 10 9.4 6.00% 50.1 49.9 0.40%
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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 1 day for observation
Material availability:
Easily found
Safety concerns:

The oven should not be left unattended when the pieces of wood are left to dry in the oven for 24 hours. There is a possibility of the wood catching fire (although it is unlikely, if a proper temperature setting is used). Have fire safety equipment on standby. Be careful when removing the hot wooden blocks from the oven. Use gloves for protection.