Sunday 19 April 2015

WHAT ARE FULLERENES...????????????






A Fullerene is a pure carbon molecule composed of at least 60 atoms of carbon.



In Fullerene molecules of carbon are present in the form of a hollow sphere , ellipsoid , tube and many other shapes.



Spherical fullerenes are also called Buckyballs and they resemble the balls used in football ( soccer ).



Cylindrical fullerenes are called carbon nanotubes or buckytubes.



Buckyminster fullerene is one type of fullerene.



Its molecules have 60 carbon atoms arranged in a hollow sphere.





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WHAT IS A DIELECTRIC.....?????







Dielectrics are insulating materials or a very poor conductors of electric current.



Now you can see here in the diagram that , when the dielectrics are placed in an electric field , practically no current or very less current flows in them because , unlike metals , they have no loosely bound or free electrons that may drift through the material.



Instead electric polarization occurs also known as dielectric polarization.



Because of dielectric polarization the positive charges within the dielectric are displaced minutely in the direction of the electric field , and the negative charges are displaced minutely in the direction opposite to the electric field.




This separation of charge or polarization reduces the electric field within the dielectric.




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Wednesday 1 April 2015

HOW TO MAKE WATER FREEZE INTO ICE INSTANTANEOUSLY ..?????????





Have you ever seen water freeze instantaneously ?



Well guys , I am going to tell you how it happens..???



To get this " instant ice " effect , put some unopened bottles of water in the freezer for anywhere between 90 to 115 minutes.



The water gets supercooled ( below freezing ) , but does not actually freeze because the water does not contain enough impurities.



When you put that supercooled water on an ice crystal , it turns instantly to ice.



It will also do this if the bottle is hit hard enough.