The mass per unit volume of a substance is called density. <br/><br/>(density = mass/volume). <br/><br/>Arrange the following in order of increasing density: air, exhaust from chimneys, honey, water, chalk, cotton and iron.
Solution
Increasing density: air < exhaust from chimneys < cotton < water < honey < chalk < iron
Increasing density: air < exhaust from chimneys < cotton < water < honey < chalk < iron