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States of Matter http://www.khanacademy.org/video/states-of-matter ------------------------------------------ يتناول هذا الفيديو توضيحاً وأمثلة حول حالات المادة ------------------------------------------ شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org