Final answer:
The nominal size of lumber is its pre-planed dimensions; when referring to stud placement, the 16.0 inches distance between vertical studs is equivalent to 40.64 centimeters.
Step-by-step explanation:
The nominal size of 3/4 x 1 1/2 lumber refers to its approximate dimensions before it's been planed and finished. In terms of vertical studs used in construction, they're typically placed 16.0 inches apart. To convert this distance into centimeters, we use the conversion factor that one inch is equal to 2.54 centimeters. Thus:
16.0 inches × 2.54 cm/inch = 40.64 centimeters.
The nominal size of 3/4 x 1 1/2 lumber is the dimensions stated on the label or in the specifications. In this case, the dimensions are 3/4 inch by 1 1/2 inches. These dimensions refer to the rough size of the lumber before it is planed and smoothed. The actual size of the lumber may be slightly smaller due to the planing process.
Therefore, the distance between vertical studs, when converted from inches to centimeters, is 40.64 centimeters.