particle model of matter

• solids

  particles tightly packed in fixed position
• liquid

  particles close but can move past each other
• gases

  particles far apart ,move quickly and randomly
• when state is changed ,mass is ...

  conserved
• internal energy

  =kinetic +potential
• heating increases

  internal energy
• specific heat capacity

  the energy needed to raise temp of 1 kg by 1 degree
• specific latent heat

  the energy needed to change state of 1 kg with no temp change
• what the two types of specific latent heat

  fusion -solid to liquid

  vaporisation- liquid to gas
• how does gas pressure happen

  caused by particles colliding with container walls

  more frequent collissions -higher pressure
• pressure and volume are ...... proportional

  inversely
• if you compress a gas what happens

  you are doing work ,increases internal energy ,can increase temperature