• The density of an object is defined as its mass divided by its volume. \[ \text{Density} = \frac{ \text{Mass} }{ \text{Volume} } \]

  • This can be written on a formula triangle as:

  • The units of density are kg/m3 ("kilograms per metre-cubed") and g/cm3 ("grams per centimetre-cubed"). When answering questions, use whichever one is easiest!

  • All solids and liquids made from the same material will have the same density. This iron fork and iron screw both have same density.

  • If an object is less dense than the liquid/gas it is in, it will float. Wood floats in water, a helium balloon floats in air.

  • If an object is more dense than the liquid/gas it is in, it will sink. Gold coins sink in water, an elephant (or basically anything) sinks in air!



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