The mass per unit volume of a substance is called density. (Density = Mass/Volume). Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton and iron.


The order of densities is as follows 

Iron > Chalk > Honey > Water > Exhaust from chimneys > Air 



We know that, 

  • Particles in solids are packed tightly
  • Particles in liquids are packed with some space between them
  • Particles in gases have more space between them.


So in a fixed volume, the number of particles would be greatest in solids, followed by liquids and then gases.

Density of matter-Teachoo-01.jpg


Density of Solid > Density of Liquid > Density of Gas. 



  • Air is Gas
  • Exhaust from air has particles, so it has more mass
  • Water is liquid
  • Honey is semi-solid, so heavier than water
  • Chalk is a sold, but lighter than iron


Thus, we write

Iron > Chalk > Honey > Water > Exhaust from chimneys > Air 

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo