TYPES OF SOLID

HELLO.. HERE WE STUDY ABOUT TYPES OF SOLID.
                MAINLY SOLIDS ARE OF TWO TYPES⇛
1.AMORPHOUS SOLID
2.CRYSTALLINE SOLID

 NOW WE DISCUSS THESE IN SHORT..
                
                                         #AMORPHOUS SOLID#
*THESE ARE NOT TRUE SOLID.
*THIS WORD TAKEN FROM GREEK WORD OMORPHE THAT'S MEAN SHAPELESS.
*ARRANGEMENT OF ATOMS IN NOT REGULAR.
*NOT HAVE DEFINITE SHAPE OR GEOMETRICAL FORM.
*THEY FLOW LIKE LIQUID BUT VERY SLOW AT ROOM TEMPERATURE,SO CONSIDERED AS A SUPER-COOLED LIQUID.
*COHESIVE FORCES ARE SUFFICIENT TO MAKE THEM RIGID BUT NOT ENOUGH TO MAINTAIN REGULARITY.
*NOT HAVE SHARP MELTING POINT.
*ALSO CALLED PSEUDO SOLID .
SOME EXAMPLES : GLASS,PLASTIC,RUBBER etc.

                                #CRYSTALLINE SOLIDS#
*ARRANGEMENT OF ATOMS ARE REGULAR IN ENTIRE 3D-NETWORK.
*THEY HAVE LONG RANGE ORDER.
*THEY HAVE SHARP MELTING POINT.
*THESE ARE TRUE SOLIDS.
*THESE ARE FORMED BY LARGE NO. OF SIMILAR SMALL UNITS CALLED CRYSTALS.
*THE ANGLES BETWEEN DIFFERENT PLANES ARE DEFINITE.
*THESE HAVE SYMMETRY ELEMENTS.
 SOME EXAMPLES : SUGAR CRYSTAL,SALT CRYSTAL,DIAMOND,METAL etc.

# crystal and symmetry elements we discuss later..

     

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