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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.

Solution:

General order of density of states of matter is gases < liquids < solids. Increasing order of density is: air < exhaust from chimneys < cotton < water < honey < chalk < iron.