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"Vaporization and Liquefaction" PPT Courseware on Changes in State of Matter 8
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"Vaporization and Liquefaction" PPT Courseware on Changes in State of Matter 9
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"Freezing" PPT courseware on changes in water
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"Chemical Formula and Valence" Water in Nature PPT Courseware 6
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"Exploring the Characteristics of Vaporization and Liquefaction" Material Forms and Their Changes PPT Courseware
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