Ullage

Your word for today is: ullage
Pronunciation: /ˈʌlɪdʒ/ Definition: the amount by which a container falls short of being full.

Pubs make a considerable amount of their profits from giving short measures to their customers. The liquid that you pay for, but don't get, is the ullage. And they wonder why all the pubs are closing. It's because we are fed up with paying through the nose for the ullage!