kilemall
SOC-14 5K
For a wet vessel, displacement tonnage is important because it changes based on the load. For a vessel that isn't floating on a liquid the use of "displacement tons" is meaningless as there is nothing to displace. Second, the scale of the "hydrogen displacement ton" is not of a scale that is meaningful. That's why we use register tons for measuring useful cargo space.
What about etheric displacement, ships riding on the ether?