How can you measure the turbidity of a colloid

The Tyndall effect can be used to measure the turbidity of water. Your goal is to plan a procedure and develop a scale to interpret the data. 

What materials would you need to measure the Tyndall effect Can you select CBLs, computers, or graphing calculators to collect or interpret data  

What variables can be used to relate the ability of light to pass through the liquid and the number of the colloid particles present  

How could you relate the variables used in the experiment to the actual number of colloid particles that are present  

Thinking Criticaiiy Use the Tyndall effect to explain why it is more difficult to drive through fog using high beams than using low beams. 

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