To observe convection in a liquid.
Method:
1. Set up a Bunsen burner on a heatproof mat. Put the gauze maton the tripod but leave it just to one side of the bunsen burner.
2. Fill a 200mL beaker with 150mL 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 of potassium permanganate down the side 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 crystals is. Observe.
Results:
The potassium permanganate particles turned the water purple as we heated the beaker. The purple liquid raised up.
A Video Of The Result:
Discussion:
In this experiment the hot liquid was the potassium permanganate. The hot water rises because it is less dense.
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