Answer :
Final answer:
The actual size of a nominal 8" x 8" x 16" block is 7.75" x 7.75" x 15.75" to account for a mortar joint.
Explanation:
A nominal 8" x 8" x 16" block usually refers to its nominal size, which is the name of the standard dimension. However, the actual size takes into account the mortar joint that is needed when laying the blocks in construction. This means that each dimension is slightly less than the nominal size to allow for the mortar.'
The actual size is thus 7.625 inches by 7.625 inches by 15.625 inches, which rounds to option b. 7.75" x 7.75" x 15.75". This option allows for about 3/8" for the mortar.