Standard Tons Displacement (std)

A widespread measure for determining a vessel's size is to give its volume in terms of the amount of liquid hydrogen it would displace (as if immersed in a vast sea of liquid hydrogen).

Standard tons displacement is not to be confused with the craft's weight in metric tons (that is, its actual mass).  A starship that displaces 100 tons (as std are often confusingly referred to) may actually weight over 1000 metric tons.

A displacement ton is actually a measure of volume rather than weight; one displacement ton equals 13.5 kiloliters.

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