Definition of ullage:
(n) :
in a wine bottle, the empty space between the cork and the top of the wine; in a cask or barrel, the empty space, occupied by air, that is created by not completely filling the cask or barrel
Definition of ullage:
(n) :
in a wine bottle, the empty space between the cork and the top of the wine; in a cask or barrel, the empty space, occupied by air, that is created by not completely filling the cask or barrel