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Dramatically demonstrate the motion caused by the convection in a liquid. Fill this glass apparatus with water, then introduce a dye at the top. Heat one of the lower corners, and watch as the dye follows the path of the convection current. Apparatus is glass and measures 15 ĂÂ 20 cm. Food dye is available separately. Includes a Physical Science Fax with demonstration instructions, a detailed discussion and a reproducible student worksheet.













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