ullage

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ullage

[′əl·ij]
(engineering)
The amount that a container, such as a fuel tank, lacks of being full.
(naval architecture)
The distance from the surface of the oil in a cargo tank of an oil tanker to the top of the hatch, or to the top of the inspection cover in the hatch.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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