Question

how can you appreciate the technology of making ships float,using the material which sink in water

Answer 1

Floating and sinking is affected and determined by several factors that include:
-density of material
-shape

The property that manufactures of ships use to make ships float on water, is by designing the right shape. The shape is designed in away that ensures that the amount of water that the ship displaces is just enough to get the ship submerged slightly.

Answer 2

due to lower relative density less than 1