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प्रश्न
Define the following term:
Coefficient of superficial expansion
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उत्तर
The coefficient of superficial expansion is equal to the change in the area of a rod of area 1m2 when its temperature rises by 1°c.
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संबंधित प्रश्न
State three factors on which depend the linear expansion of a metal rod on heating.
Two iron rods – one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?
Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
An iron washer is heated. State the effect on its mass.
Give scientific reason.
An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
Give scientific reason.
The telephone wires which sag in summer become straight in winter.
Define the following term:
Coefficient of cubical expansion
A bimetal strip is shown in the below diagram before heating. Draw a diagram to show how it bends on heating and on cooling.
Explain thermal expansion with suitable examples.
Analogy:
Expansion is length:: Linear expansion.
Expansion in volume:: ______.
