ullage
Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License
- noun In a wine bottle, the empty space between the cork and the top of the wine.
- noun In a cask or barrel, the empty space, occupied by air, that is created by not completely filling the cask or barrel.
- noun In an industrial setting, the empty space in a tank, such as for fuel.
Examples
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All air is carefully excluded from the casks, any ullage is immediately checked, and as evaporation is continually going on the casks are examined every fortnight, when any deficiency is at once replenished.
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Sunday the 2d, this morning found the store-tent robbed of brandy, filled up all the ullage casks, picked up about the rocks abundance of clams, a shell-fish not unlike our cockles: These fish are at present the support of our life.
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NASA said the word 'ullage' comes from the French term 'ouillage,' used in winemaking to describe the space between wine and the top of a storage container. In this case, it refers to the space at the top of the first stage fuel tank and the need to push the fuel to the bottom of the tank.
Note
'Ullage' comes from the French 'ouiller,' to fill up a cask, which comes from the Latin 'oculus,' eye.
