净空高度(英语:air draft、air draught)是指从水面到船舶最高点的距离。这与船舶的吃水深度类似,吃水深度是从水面到船体沉入水下部分最深处的距离。不过,净空高度表示高度,以向上为正值,而吃水深度表示深度,以向下为正值[1][2]。
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