Popular Terms
Free space above the liquid contained in a barrel, drum, or tank, provided to accommodate expansion of the liquid.

Use 'ullage' in a Sentence

Its important to leave a little ullage in bottles with carbonated beverages, otherwise you would never be able to even open them because they would immediately explode from the pressure of even the slightest movement.
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You need to always leave enough space for the ullage so that a barrel does not blow up or leak.
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We had to remember not to fill it the whole way because otherwise there would not be any ullage and things would not go well.
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