Could you please help me understand what is being asked?

Could you please help me understand what is being asked?
Part of this unit concentrated on gaseous molecules, but stated that liquids and solids can also consist of molecules. Ethanol and aqueous film-forming foam are examples of liquid molecules. Discuss how the thickness (viscosity) of ethanol or aqueous film forming foams can be changed. Does the foam have a higher or lower molecular weight? Why, or why not?
 
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