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Density


  • Density is the measure of how close and how heavy are the particles of matter in an object. It is measured in kg/m3 or g/cm3 or g/mL.
  • Rule for Density m
Density = Mass / Volume
  • Example of Density Rule
Q. A stone has a mass of 10 grams. When it is immersed in a measuring cylinder of water, the water level rises 5 millilitres. What is the density of the stone?
A. Density = mass / volume
= 10 grams / 5 mL
= 2 g/mL
  • Densities of Some Common Substances

SUBSTANCE

DENSITY (g/mL)

Air

0.002

Feathers

0.045

Petrol

0.7

Water

1

Aluminium

2.7

Lead

11.3

  • Floating and Sinking

The density of water is 1 g/mL. Any substance (such as ice, petrol or oil) whose density is less than 1 will float. Any substance (such as lead) whose density is more than 1 will sink.