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Curated by: TED-Ed (48 videos)
View full lesson: http://ed.ted.com/lessons/describing-the-invisible-properties-of-gas-brian-bennett How do you explain the properties of something we can't see? See how scientists use scientific principles, such as gravity, to observe gases. This lesson explores gases and how we have come to know what we know about them. Lesson by Brian Bennett, animation by Cognitive Media.