Foams

A foam is a substance formed by trapping ___ _____ __________ ___ ________.
_______ _________ ______ _________ ____.
___ ____ _____ _____ _____ ______ _______ _______.
_____ _________ __________ _______ ___ _________ _______ ______ _________ _____.
_____ ________ ______ ________ ________ ___ __________ ______ __________ __________ ___.
_________ __________ _________ ___ _______.
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