4th may 2018
When the particles are heated the distance between the particles increases.This means that objects will expand.When liquids or gases expand they become less dense.A gas or liquid which is less dense will rise through a more dense gas or liquid.This is explanation for well-known tendency of hot fluids to rise and cold fluids to rise and cold fluids to sink.Scientist call this process convection.
Aim: To observe convection in a liquid.
Equipment: 200ml beaker water, tweezers, a crystal of potassium permanganate, a drinking straw, bunsen burner, heat mat, tripod and gauze mat.
1. Set up a bunsen burner on a heatproof mat.Put the gauze 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 of potassium permanganate down the inside of the straw.Wai 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 and slide it under the tripod so that you are only heating the outside of the beaker where the crystal is. Observe.
When the particles are heated the distance between the particles increases.This means that objects will expand.When liquids or gases expand they become less dense.A gas or liquid which is less dense will rise through a more dense gas or liquid.This is explanation for well-known tendency of hot fluids to rise and cold fluids to rise and cold fluids to sink.Scientist call this process convection.
Aim: To observe convection in a liquid.
Equipment: 200ml beaker water, tweezers, a crystal of potassium permanganate, a drinking straw, bunsen burner, heat mat, tripod and gauze mat.
1. Set up a bunsen burner on a heatproof mat.Put the gauze 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 of potassium permanganate down the inside of the straw.Wai 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 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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