Aim: To observe convection in a liquid
Method:
1. Set up a bunsen burner on a heatproof mat. Put the gaze mat on the tripod but leave it just to one side of the bunsen burner.
2. Fill a 200 ml beaker with 150 ml cold water
3. Place the beaker on top of the tripod and gauze and allow it to settle for a few minutes
4. Carefully insert a drinking straw down one side of the beaker, ensuring the straw is touching the bottom of the beaker. Be careful as you do not want to disturb the water too much.
5. Using tweezers, drop a crystal down inside of the straw. Wait for the crystal to settle on the bottom of the beaker.
6. Very gently, so to not disturb the water, remove the straw.
7. Light the Bunsen and slide it under the tripod so that you are only heating the outside of the beaker where the crystal is. Observe
Results: We had to wait for the crystal to finish when it was in the tube. Then slowly, we lifted the straw and the crystal expanded.
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