Question

Why a ship sinks more when entering the river from the sea

Answer 1

because the density of river water is less than the sea water therefore in sea upthrust is more as compared to river water

Answer 2

A ship sink more in river water than in sea water because the density of sea water is more than that of river water due to the presence of impurities.

OR


The specific gravity of fresh water is 1.000. The specific gravity of sea water is 1.025. These the accepted figures that are used for stability calculations, and of course will vary a bit depending on local conditions, and to a lesser extent, temperature.

So, staying with the accepted figures, this gives a useful ratio of 35 to 36, coming also from the convenient fact that 35 cubic feet of 1.025 SG ocean water weighs one long ton (2240 pounds) and 36 cubic feet of fresh water also weighs one long ton. Back before the SI system, that was actually very convenient in calculations for buoyancy and displacement.

This means that if ship draws 35 feet, or inches or meters in salt water, it will sink in fresh water until it draws 36 feet, or inches, or meters in fresh water.

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