Ullage

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1. Beverage wastage that can be written off against tax or other costs. This can be due to leakage or deterioration, or else used in accounting to account for wastage when pulling beer through the lines or spilled during pouring into drip-trays.
2. The air space in a wine bottle (or barrel). Older wines will show more space from evaporation or cork absorption. The lower the level the more likely the wine may be spoiled.