Question

How much change in width would you expect to see in a 1-inch x 8-inch x 10-foot (25- by 200- by 3050-millimeter) board when the relative humidity changes from 25 to 85 percent?

(a) 1/8 inch (3.18 millimeters)
(b) 1/4 inch (6.35 millimeters)
(c) no significant amount

Answer

The board will likely expand in width by 1/8 inch (3.18 millimeters).