" Life without adversity is water without density. " 

Density

Floating and sinking can be puzzling. Why does a light copper coin float when it is put on water? Why does a much heavier oak log float?

Density Basics

Important things to know

• The density of a substance is the mass of 1 cm³ of it.

• The unit of density is grams per cubic centimetre, written g cm^-3.

• Iron has a density of 7.8 g cm^-3. This means that each cubic centimetre of iron has a mass of 7.8 g.

This shows which is what density.

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A Density Ladder

Density

​The density of a substance depends on two things:

The mass of its atoms (or molecules).

how closely these atoms (or molecules) are packed together.