Now I don't understand what you mean. This is exactly what I wrote?snrdg121408 wrote: ↑ Not according to the definition

Volume displacement is the displacement of a fluid expressed in terms of volume as distinguished from displacement expressed in terms of mass. https://www.merriam-webster.com/diction ... splacement

AnotherDilbert wrote: ↑Mass displacementexpresses that in mass: A ship displaces 1 tonne of liquid hydrogen (hence a volume of ~14 m³).

Volume displacementexpresses that in volume: A ship displaces 14 m³ (hence a mass of 1 tonne of liquid hydrogen).

Still don't understand what you mean.snrdg121408 wrote: ↑ The volume of about 14 m^3 is determined by using a grid of 1.5 m squares of which two squares. One square is 1.5 x 1.5 by approximately 3 m. Two squares is 1.5 x 3 x approximately 3 m = approximately 13.5 or about 14 m^3.

I lay out 100 squares which equates to about 1,400 m^3 of displaced L-Hyd which is equal to 100 ton volume displacement of L-Hyd. That does say that 1 ton of L-Hyd = 1 tonne = 1,000 kg.

Yes, trivially 1 tonne of liquid hydrogen has a mass of 1 tonne.

Yes, trivially ~14 m³ of ship will displace 1 tonne of hydrogen.

Neither statement says anything about the mass of the ship. Ships are not made of liquid hydrogen, nor are they generally immersed in liquid hydrogen.

If LBB2'77 intended ships to be designed by mass, it would have been much easier to leave out the displacement nomenclature and simply talk about mass in tonnes?