Discuss a few applications of expansion of solids.
Answers
1. For example telephone and electric wires are arranged little bit loosely between any of the two poles. It is simply because with the decrease in temperature in winter season, the wire contracts and if they were arranged tightly that will become further tight and they may break. To avoid this problem, they were arranged loosely.
2.Between the two rails on a railway track always a small gap is left. In the summer with the increase in temperature they expands as this materials are made up of metals. One end of the rail is fixed and other end is having a small gap with the next one. The expansion can happen in the gap therefore the track will remain intact.
3. In electric glass bulbs tungsten is used as a filament. The linear expansion coefficient of the glass is close to that of the tungsten therefore with the increase in the temperature both of them expands equally so that the use is not going to fail for a long time.
4. When water is sprinkled on a hot chimney glass only at the particular points the glass contracts and that is the reason why the glasses going to break.
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