Ullage is the space in a bottle or barrel that results from the wine inside evaporating or leaking out, either past the side of the cork or through not-too-well sealed barrel staves.
When this happens in barrels, winemakers refer to this loss from evaporation as the "angel's share" of the wine.
For wine to last a long time it needs as little air contact as possible to prevent oxidation.
Winemakers top up their barrels frequently to keep the air space to a minimum. Most wine bottles are fitted with a capsule that hides the cork.
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