Describe experiments to demonstrate convection in liquids; heating water in a beaker and model of hot water system experiment

Describe experiments to demonstrate convection in liquids; heating water in a beaker and model of hot water system experiment

Experiment: heating water in a beaker

Procedure:
1. Put water in a beaker until it is three quarters full and place it on a tripod stand.
2. Drop a crystal of potassium permanganate through a tube to settle at one corner at the bottom of the flask.
3. Heat the water gently using a Bunsen burner and observe the movement of streams of colour.

Discussion:
A stream of colour will be seen moving upwards and downwards again at the other side of the beaker. This will continue gradually until all the water becomes coloured. This shows that convectional currents also exist in liquids.

Experiment: model of hot water system

Procedure:
1. Obtain two flat bottomed flasks and set up the apparatus as shown below.
2. Hold the flasks in place by use of clamp stands.
3. Heat the bottom of the lower flask and observe what happens.

Discussion:
When the water in the lower flask becomes hot it rises up to the upper flask. After some time the water in the upper flask will become hot due to convectional currents.

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raphael answered the question on October 11, 2018 at 05:35

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