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Double Thistle Tube, Osmosis Apparatus magnifies the volume and color changes of diffusion. Clarifies the concept of osmosis.

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Molecules diffuse through the semi-permeable membrane at the bottom of the double thistle tube. The thin column of the thistle tube magnifies the volume and color changes. The concept of osmosis will be clear to your students after they witness the osmotic changes using this apparatus.

This easy-to-use set includes a 16" double thistle tube, an aluminum thistle tube support stand, a battery jar, a semi-permeable membrane and instructions.