ullage
/ˈʌlɪdʒ/noun
mass noun
1- the amount by which a container falls short of being full（容器未装满部分）空高。
1.1
- loss of liquid, by evaporation or leakage损耗, 漏损。
词源
late Middle English: from Anglo-Norman French ulliage, from Old French euillier 'fill up', based on Latin oculus 'eye' （with reference to a container's bunghole）.