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this is a very dramatic experiment with which can learn about surface tension. take a glass
full of colored water and some coins. now add more colored water to the glass until
it is level filled with water. add some more water with the help of dropper. keep adding
until you think you can add no more water. the water is level fill up to the brim. now
take a coin and gently drop it in the glass. keep adding more coins. you will be surprised
to see how many coins can can a glass full of water swallow. this is because the water
has a skin on the top and because of surface tension the skin keeps the water inside the
glass. add some more coins. now you can see the level is vibrating, it bulges out, it
becomes convex. but still you can add some more coins. in the end of course the water
will spill out but before that a glass full of water swallowed many many coins and this
is all because of surface tension. now empty out the glass and see how many coins it has
swallowed. it fun!