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Wednesday, 9 May 2018

Convection

Aim: To observe convection in a liquid.

Equipment:

  • 200 ml beaker
  • tweezers
  • a crystal of potasium permagante
  • a drinking straw
  • bunsen burner
  • heat mat 
  • tripod
  • gauze mat
Method:

  1. Set up a bunsen burner on a heatproof mat .Put the gauze mat  on the tripod but leave it just to one side of the bunsen burner.
  2. Fill 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 you do not want to disturb the water to much.
  5. Using tweezers , drop a  crystal of potasium permagante down the inside of the straw.Wait for the crystal to settle on the bottom of the beaker.
  6. Very gentle.so to not disturb the water , remove the straw.
  7. Light  the bunsen burner and slide it under the tripod so that you are only heating the outside of the beaker where the crystal is Observe.

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