EXERCISE 40 



Problem. Do liquids diffuse in the same way as gases do ? 



What to use. Transparent container for water (jar, beaker, glass) ; medi- 

 cine dropper ; red ink or a dye such as eosin solution. 



What to do. Let the water in the beaker stand for twenty minutes to make 

 certain that there are no movements or currents in it. Place a large drop of 

 red ink (eosin) gently in the middle of the surface. 



Record. Note what happens to the pigment placed in the jar of water. De- 

 scribe final result. Make a diagram to show by means of arrows the direction 

 followed by the current of pigment. 



Questions. 1. In what ways does diffusion in liquids resemble diffusion in gases? 

 2. In what way does diffusion in liquids differ from diffusion in gases ? 



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