Dyfuzja (Diffusion)

TEA BAG DIIFFUSIION
Tea bags are used to demonstrate the importance of heat in the movement of
molecules through a cell membrane.

MATERIIALLSS::
Tea bags
Paper towels
Water
Container to water
Measuring tape
PROCEDURE::
1. Heat 2 cups of water to a boil.
2. Fold a paper towel into fourths.
3. Place the tea bag into the hot water for 15 seconds. Remove tea bag from the
water and place it onto the center of a paper towel for 15 sec.
4. Remove tea bag and record the diameter of the water stain remaining on the
paper towel.
5. Use room temperature water and ice cold water for experimentation.
EXPLLANATIION::
Diffusion is defined as the movement of a substance from an area of higher
concentration to an area of lower concentration. Temperature affects the rate
of diffusion through a cell membrane the same way it does through a tea bag.
The size of the water stain should be noticeably greater with the warmer water.
The addition of heat to the tea bag causes its molecules to move much faster
than at room temperature. This energy is more readily released in a shorter
period of time than a tea bag filled with room temperature or cold water.

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