Definitions:

1. Empty space left in a container typically present to allow for the expansion of liquids, especially during transportation or temperature changes, to prevent spillage or pressure buildup. NOUN
   • Proper ullage is essential during transportation to prevent leakage or bursting in the fuel containers.
2. In winemaking, is a space important in the aging process. to prevent oxidation and spoilage of the wine. NOUN
   • The ullage in the wine bottle was larger than usual, which made me worry about potential spoilage.
3. Refers to the empty space left in a container, such as a barrel, tank, or bottle, that is not filled with fluid. NOUN
   • The winemaker checked the ullage in the barrels to ensure there was enough space for the wine to expand.

Synonyms:

• headspace