8560
Water - air interfaces have a special relevance in this field : many water - insoluble molecules can be spread on water and , given the right spreading conditions and enough available surface area , their spreading proceeds until a monolayer ( a one - molecule thick layer ) eventually remains .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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