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.
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
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