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ullage
Ullage or headspace is the unfilled space in a container, particularly with a liquid.〔
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==Etymology==
The word comes ultimately from the Latin ''oculus'', “eye”, which was used in a figurative sense by the Romans for the bung hole of a barrel. This was taken into French in the medieval period as ''oeil'', from which a verb ''ouiller'' was created, to fill a barrel up to the bung hole. In turn, a noun ''ouillage'' was created, which was the immediate source of the word's modern form, first recorded in Norman English about 1300, at first in the sense of the amount of liquid needed to fill a barrel up to the bung hole.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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