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.

Answer

The order of densities is as follows 

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

 

Explanation:

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

So, 

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

 

Now,

  • 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 

  1. Class 9
  2. Chapter 1 Class 9 - Matter In Our Surroundings (Deleted)

About the Author

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo