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The thermal expansion of wood, however, is quite small and requires exacting techniques for its measurement. Thermal Expansion. Wood (and plywood) expand upon heating as do practically all solids.
Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more
Use this fast, easy method to calculate wood shrinkage and expansion in the lumber for your next project.
The thermal expansion of wood in the direction of the grain is very little. In the radial and tangential directions, temperature movements are much greater. The relationship between the thermal expansion coefficients and moisture contraction coefficients of wood in different directions relative to the grain is in the same class in terms of size.