### Question
Can you define what cavity means?


### Answer
**Cavity** is defined as the following in *15 U.S.C. § 8702*:

> the open space in the mold of a block machine capable of forming a single concrete masonry unit having nominal plan dimensions of 8 inches by 16 inches

#### Citation:
  - *15 U.S.C. § 8702*
  - Heading: **CHAPTER 113-CONCRETE MASONRY PRODUCTS RESEARCH, EDUCATION, AND PROMOTION**

