156 SOILS: PROPERTIES AND MANAGEMENT 



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Fig 23 — Diagram showing the possible range m the size of colloidal 



particles. 



104. The properties of colloids. — In general there are 

 certain properties which materials in a colloidal state 

 exhibit and by which they are distinguished from true 

 solutions. In the first place, since they are not in 

 true solution they exert little effect on the freezing 

 point, on vapor tension, and on vapor pressure. Some 

 colloids have -absolutely no effect on these conditions, 

 while others, as they allow a certain small amount 

 of true solution to take place, do possess such 



