Is an iron object heavier than that of wood?
OR
Why is 1cm cubed of wood lighter than 1 cm cubed of iron?
Difficulty: Easy
Because centimeters cubed is a unit of volume, not weight. The two might take up the same amount of space, but iron is much denser and as such weighs more.
Density = $\frac{(Mass of a substance)}{(volume of the substance)}$
OR
D=$\frac{m}{v}$
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