Assertion (A): Dimensional changes in wood result due to variation in the moisture content of the wood with atmospheric
condition.
Reason (R): The cell walls in wood are highly hygroscopic and when exposed to moisture, absorb large amounts of water
and swell.
Both A and R are true and R is the correct explanation of A
Both A and R are true and R is the correct explanation of A
Dimensional changes in wood occurs due to variation in the moisture content of the wood with atmospheric condition. Any
drying of wood below the fibre saturation point result in shrinkage. If a dry piece of timber is kept in saturated atmosphere
timber absorbs water from air up to about 15% of its weight. This water goes into the cell walls which tend to swell up.
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