South Dakota Administrative Rules
Title 12 - Department of Agriculture
Article 12:26 - Eggs and egg products
Chapter 12:26:01 - Definitions
Section 12:26:01:03 - Terms defining air cell condition

(1) "Depth of air cell," the distance from the top of the air space between shell membranes, normally in the large end of the egg, to its bottom when the egg is held air cell upward;

(2) "Free air cell," an air cell that moves freely toward the uppermost point in the egg as the egg is rotated slowly;

(3) "Bubbly air cell," a ruptured air cell resulting in one or more small, separate air bubbles usually floating beneath the main air cell.