ullage // noun [U; sing.]

1

the difference between the amount of liquid that a full container holds and the amount that is put in it or that is left in it after some of the liquid changes into gas (evaporates) or gets out (leaks); the empty space that this leaves:

The heat had caused considerable ullage.

2

the contents of a container at the time it is imported:

The ullage of each barrel was 20 litres.

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