Density of a substance is its mass per unit volume, normally expressed as tonnes per cubic metre in ship calculations.Relative Density of a substance is the ratio between the density of that substance and the density of fresh water.Displacement of the ship is the weight of the ship and its contents or the weight of water displaced by the ship in that condition.Displacement = Underwater volume of the ship x the density of the water in which she is floating.It should be noted that the volume of displacement is the underwater volume of the ship. When a ship proceeds from water of … [Read more...]