Surface tension of liquids 2

Surface tension of liquids 2

In this video we are experimenting with food colourings.

01:06

Chemistry

On-screen labels

food colouring, milk, liquid soap, Add a few drops of food colouring to the milk., Dip the cotton bud into liquid soap., Observe what happens when the cotton bud touches the surface of the milk., When we drop food colouring on the surface of the milk, it does not spread much because of the surface tension of the liquid. However, soap significantly reduces the surface tension, thus the food colouring particles spread towards the edge of the pot.
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