Expansion, Compression and Density

Expansion, Compression and Density

1. Expansion

   • Most materials
     • Expand when heated
     • Contract when cooled
     • Gases expand > solids or liquids
     • Most solids expand when melted
   • Exceptions
     • Water
       • Expands when frozen
       • Contracts when cooled

2. Density

   • The measure of how close particles are packed together, in a solid, liquid or gas
   • The density of liquids and gases can be changed
   • The density of a solid can not be changed

3. Compression

   • Solids
     • Cannot be compressed
   • Liquids
     • Can only be compressed a little bit
   • Gases
     • Can be compressed
   • Air Pressure
     • Higher outside than in = explode
     • Higher outside than in = implode