Question

What is density?
Arrange the following in order of increasing density - air, exhaust from chimneys, honey, water, chalk, cotton and iron.

Answer 1

→Density=[mass/volume]
The amount per unit size of any substance is called density.

INCREASING DENSITY:
Air→Exhaust from chimneys→cotton→Water→Honey→Chalk→Iron.

Answer 2

Density is defined as the mass of a material contained in unit volume.
Mathematically, Density = Mass/Volume
It's SI unit is kg/m^3.

In order of increasing density
air < exhaust from chimneys < cotton < water < honey < chalk < iron.