GCSE Physics (AQA)

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Density

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Particle model of matter Changes of state and the particle model

Density

1:42 Density and States of Matter
Spec 4.3.1.1
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  • Density of a material is defined as how much mass a certain volume of the material contains.
  • Examples given include a feather (low density) and a rock (high density), compared to materials like wood, foam, and metals.
  • Density is distinct from mass; one kilogram of feathers and one kilogram of rocks have the same mass but different densities.
  • For exam purposes, exact densities are not required, but recognizing common examples of light and heavy objects is necessary.
  • Relationship between mass and density: for two objects of the same volume, the one with higher density will have greater mass.
  • Example: a wooden ball and a metal ball of the same volume; the metal ball, having higher density, will also have a greater mass.
  • To determine an object's density, measure its mass and volume.
  • Mass can be measured using a pan balance.
  • Volume can be measured by placing the object in water and observing the water displacement or calculating mathematically for regular shapes like spheres.

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