Physical density and optical density

Bottle used to measure density and relative density of a liquid .......

What are low density and high density polythenes? How are these manufactured ? Why do these differ in densities?

How do the density of an object and density of liquid affect sinking and floating?

Differentiate between density and relative density of a substance.

A body of density d is counterpoised by Mg of weights of density d_1 in air of density d. Then the true mass of the body is

The refractive index of diamond is 2.42, whereas for air it is 1.0. What does it tell you about optical density and speed of light in air and in diamond?

Vapour density

Give formula for Density and relative density.

Arrange air, glass, and water in the ascending order of optical density.

How do you measure density of a liquid using a density bottle?