Question

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. [3 MARKS]

Answer 1

Arrangement in order : 1.5 Marks
Explanation: 1.5 Marks

1. Air
2. Exhaust from chimneys
3. cotton
4. Water
5. Honey
6. Chalk
7. Iron

Explanation:

Air is a mixture of gases. Chimney exhaust is also a mixture of gases; along with some heavier particles, such as ash. This makes the density of chimney exhaust more than air. Cotton is a porous solid and which has a lot of air trapped within pores. This makes its volume more than water. Therefore, it is less dense than water.
Density is mass/volume, when the mass is high per unit volume, density is also high.