AIM
To observe convection in a liquid.

Method
- set up a bunsen burner on a heatproof mat. Put the gauze mat on the tripod but leave it just to one side the bunsen burner...
-fill a 200mL beaker with 150mL of cold water
-Place the beaker on top of the tripod and gauze mat and allow it to settle for a few min...
-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 lift the straw out of the beaker...
-Using tweezers drop a crystal of potassium permanganate down the inside of the straw. Wait for the crystal to settle on the bottom of the beaker.
-Very gently, so to not disturb the water, remove the straw...
- Light the bunsen burner and slid in under the tripod so that you are heating the outside of the beaker where the crystal is... then watch.

as the beaker heated the potassium permanganate started to spread more after a couple of seconds the collar purple filled the beaker...

the hot water rises because of it less dense and because the hot water is less dense it allows the potassium permanganate could rise and spread around the beaker...