.... . .
. .
6. Electric conductivities of the milky and the transparent layers of "DU DARFST"

Compare the milky and the yellow layers of the previous experiment using a battery and a  LED

The battery used has 9 Volts, the electricity used in households has 220 Volt.
NEVER use electricity of 220 Volt for your experiments, IT COULD KILL YOU!

*Left: Connect the negative terminal of the battery with the short lead of a  Light Emitting Diode (LED).
*The positive terminal connect with a piece of metal (a paper clip would be better than the injection needle on the photo).
* Dip the long lead of the LED and the needle into the yellow layer of "Du darfst":
  Only a dim light shows that this yellow fat layer is a week conductor for electricity.
* Middle:  Repeat the experiment with the milky layer of "Du darfst".
* Bright light shows that the milky water layer is a good conductor for electricity.
* Right:  "Du darfst" mainly consists of water which is kept solid by food gelatine.
   0.5 % of "Du darfst" are table salt ("Speisesalz") which is responsible for the electric conductivity.


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