1 - 3. Surface Tension | 4. More Surface Tension | 5. All About Electrolytes | 6. Hydrolysis | 7. A Cartesian Diver | 8. A Lava Lamp See how we built our Young Scientist computer. Water Experiments 1, 2 and 3 Surface Tension Experiment: There are lots of ways to examine the skin on the surface of water. These are just a few.
(ii) Ask a friend to float a cork in a glass. Ask them to float the cork in the centre of the glass without touching it! The cork will have a natural tendency to float at the edge. How do they do it? Fill the glass until it is just about to overflow. You'll notice the water rise slightly above the top of the glass - again water tension keeping the water in check and causing it to form a slight bulge. The cork floats away from the edge of the glass!
Materials:
You will need:
Basin Method:
What you have to do:
1) Fill the basin
about half full with water. 2)
Get some tissue paper and lay it on the surface of the water. 3)
Place a paperclip on the tissue paper. 4)
We sank the tissue carefully.
Result:
The paperclip floated with no support. Conclusion:
The paperclip floated because it was resting
on the surface skin of the water. Observe the surface of the water
carefully as the
NOW, drop a single drop of washing up soap on the water surface and
observe what happens. Soap destroys water skin - the clips should sink.
Sixth |
(i) Take a 10c coin and using
an eye dropper, see how many drops of water you can put on the coin
without it overflowing on to the table.
