In class, we have discussed density as being "how much matter (stuff) something has in a given (specific) volume.

We have also used the formula for calculating density. This formula can be written several ways but they all mean the same thing:


Density is equal to Mass divided by Volume.


or


Density = Mass ÷ Volume


or


d = m / v

Units used in Density.

We measure mass in units like grams (g) and kilograms (kg).

We measure volume in in units like milliliters (ml) and cubic centimeters (cm³).
One milliliter (1ml) is equal to one cubic centimeter (1cm³). Written another way, 1 ml = 1 cm³.

We write the unit for density as grams per milliliter (g/ml) or grams per cubic centimeter (g/cm³).


Here's an example of using the above information:

Tanya needs to find the density of a brick.
  • First, Tanya measures the mass of a brick. She finds that the brick's mass is equal to 32 grams.


  • Next she wants to know its volume. She measures the brick's length, width and height. She finds that the brick's dimensions are 4 cm x 2 cm x 2 cm. By multiplying the measurements she finds the volume to be 16 cm³.


  • Tanya then uses the density formula to calculate the brick's density.
  • d = m / v ----->
  • d = 32 g / 16 cm³ -----> 2 g / cm³
  • The density of Tanya's brick is 2 grams per cubic centimeter (2 g/cm³). We can also write this as 2 grams per milliliter (2 g/ml).