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Cosmic Absurdities
The BBC today reported that archaeologists in China have found the worlds oldest observatory. The semicircular platform (130 feet in diameter) surrounded by 13 pillars was unearthed near the city of Linfen in the Shanxi province. The remains are...
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Chapter IV. Development of a society "… There is no people with such heavy historical burden and with such spiritual power as ours; anybody can not judge a martyr who temporarily has fallen to a cross; but have gained gift to itself - invisibly...
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Astrodynamics delivers conundra of astronomical proportions. The sheer size of the Universe, its mass and the velocities of bodies stretch the imagination to the limit. It is little-known that Einstein did NOT receive the Nobel Prize for...
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A spring called: Drop of water

Do you know what happens when a drop of water hits a non-absorbent surface? Yeah you’re right (if you don’t have the answer, please re-read the title of this column), the drop bounces upwards.

A French scientific team from the Collēge de France have studied the scene carefully with a camera that took 40000 images per second. Here are the results:
At first, when it hits the surface, the drop flattens. Then, it bounces up due to the movement energy it had when falling down. The drop will continue going upwards eventually taking the shape of a needle. Afterwards, the drop falls upon itself, into itself. It thus takes the shape of a pancake (again) but this time, the drop is in midair.

This phenomenon is different to a drop falling on other surfaces as in this case, the drop crashes on the surface leaving only a small quantity of the water to bounce up.
Physicists have also found out that the actual speed of a drop influences its deformation but not the time taken for it to get in contact with the surface. This actually depends upon the mass of the drop.

Anyway why


is all this stuff important anyway? Scientists believe that this find may be of interest to the industry. There’s a small illustration:
Imagine not seeing droplets of rain on your car’s windscreen when it is in fact raining cats and dogs outside. Cool, isn’t it? Well this may well be possible with these new data obtained by the scientists from the Collēge de France. How though? Easy enough! The period of contact of the raindrops with the windscreen is so minimal that the driver does not even see them!

Water drops bounces like springs, would you ever have thought of this? No, I’m not sure you would.

About the Author

K.A.Cassimally is the editor in chief of Astronomy Journal and Astronomy Journal Ezine. He is also the co-founder of the RCPL Astronomy Club. K.A.Cassimally is best known for his article 'Harry Potter and the Moons of Jupiter'.
He is also Senior Columnist at BackWash.com where he writes 'Not Scientific Science'.
Website: http://www.rcplastronomyclub.zik.mu
:http://www.backwash.com/content.php?id=358
Email: kcassimally@rcplastronomyclub.zik.mu

 

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