Like liquids, amorphous solids have a tendency to flow, though very slowly. Therefore, sometimes these are called pseudo solids or super cooled liquids. Glass panes fixed to windows or doors of old buildings are invariably found to be slightly thicker at the bottom than at the top. This is because the glass flows down very slowly and makes the bottom portion slightly thicker.
Friday, May 31, 2013
amorphous solid properties examples structure
An amorphous solid (Greek amorphos = no form) consists of particles of irregular shape. The arrangement of constituent particles (atoms, molecules or ions) in such a solid has only short range order. In such an arrangement, a regular and periodically repeating pattern is observed over short distances only. Such portions are scattered and in between the arrangement is disordered.
Glass, rubber and plastics are typical examples of amorphous solids.
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| amorphous of structure |
Glass, rubber and plastics are typical examples of amorphous solids.
crystalline solids properties structure examples
A crystalline solid usually consists of a large number of small crystals, each of them having a definite characteristic geometrical shape. In a crystal, the arrangement of constituent particles (atoms, molecules or ions) is ordered. It has long range order which means that there is a regular pattern of arrangement of particles which repeats itself periodically over the entire crystal. Sodium chloride and quartz are typical examples of crystalline solids.
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| structure of crystalline solids |
General Characteristics of Solid State
The following are the characteristic properties of the solid state:
(i) They have definite mass, volume and shape.
(ii) Intermolecular distances are short.
(iii) Intermolecular forces are strong.
(iv) Their constituent particles (atoms, molecules or ions) have fixed positions and can only oscillate about their mean positions.
(v) They are incompressible and rigid.
(i) They have definite mass, volume and shape.
(ii) Intermolecular distances are short.
(iii) Intermolecular forces are strong.
(iv) Their constituent particles (atoms, molecules or ions) have fixed positions and can only oscillate about their mean positions.
(v) They are incompressible and rigid.
Thursday, May 16, 2013
Average speed of a particular airplane is 729.8mi/h. What's speed in m/s ?
Average speed of a particular airplane is 729.8mi/h. What's speed in m/s ?
Average speed pf plane in m/s = 
cancel out the values we get
Average speed = 729.8* 1909.36 / 60*60 m/s
= 326.25 m/s
Answer = 326.25 m/s
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| Average speed of particular airplane is 729.8 mi/h . What is the speed in m/s? |
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