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Your Safer Source for Science
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When molecules are the size of balls, phase changes such as melting and evaporation can be very “moving” events! A tubful of rubber balls is a perfect demonstration device for comparing the energy and motion of molecules in the solid, liquid, and gas phases. It’s time to put the “kinetic” back into the kinetic–molecular theory!


  • Kinetics
  • Distillation
  • Evaporation
  • Phases of Matter
  • Condensation