what is the primary cause of diffusion?
User: What is the primary cause of diffusion? some substances can dissolve in solvents heat added to a substance random internal motion of atoms and molecules attraction of opposite atomic charges Weegy: Primary cause of diffusion is random internal motion of atoms and molecules. User: What is meant by elastic collisions? heat given off by constant collisions compression of the gas resultant force of all collisions collision and rebound without loss of energy