| http://www.w3.org/ns/prov#value | - The method is designed to independently study the following important variables: 1) foam quality (the volume of gas in the foam) 2) pressure 3) temperature 4) surfactants and other additives such as polymers that are typi- cally added to foams 5) bubble size of gas in the foam 6) surface roughness, which affects the flow of foam along a pipe wall
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