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, wter,chalk,cotton and iron.

Explanation

To arrange the substances in order of increasing density, we need to understand the density of each substance mentioned in the question. The formula for density is given as:

\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]

Now, let's analyze the substances one by one:

1. **Air**: Air is a gas and has a very low density. It is less dense than most solids and liquids.

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