KMT Explains Physical Changes

Diffusion:

  • Movement of particles from area of high to low concentration

  • Ex. Tea bag in hot water

Dissolving:

  • A solid that mixes with liquid to form solution

  • Particles in solid are in constant motion & move in empty spaces between liquid particles

  • Ex. Ocean water

Thermal Expansion:

  • Expansion of heated substances

  • High temperature=more kinetic energy

  • Particles vibrate fast then move

  • Ex. Metal warping on hot day