Sentence:  Pretreatment of oil or sea water with dispersants or demulsifiers generally inhibits laboratory <WSD>mousse</WSD> formation with most of the oils and petroleum products tested (Berridge et al. , 1968b; Bridie et al. , 1980a,b). 
Meaning of the word marked with <WSD> tags:  A stable emulsion of water and oil that is created by wave action churning the water where an oil spill occurs.