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प्रश्न
What do you understand by thermal expansion of a substance?
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उत्तर
The expansion of a substance on heating is called the thermal expansion of the substance.
संबंधित प्रश्न
What is matter? What is it composed of?
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?
Iron rims are heated before they are fixed on the wooden wheels.
Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
Water is heated from 0°C to 4°C. Will it expand?
Give scientific reason.
The telephone wires which sag in summer become straight in winter.
At what temperature the pure water has (a) maximum density (b) minimum volume?
Define the following term:
Coefficient of superficial expansion
Define the following term:
Coefficient of cubical expansion
Give reasons for the following:
In cold countries, water pipes burst in winter.
The diagram shows a sketch graph showing a change in volume of a given mass of ice at -5°C to water at 15°C.
(i) Why does the temperature along BC remain constant?
(ii) When is the volume of water minimum?
(iii) At what temperature does water have maximum density? Explain.
Complete the following sentence:
When ice melts its volume ______ and density _______.
Solids ______ on heating and ______ on cooling.
Analogy:
Expansion is length:: Linear expansion.
Expansion in volume:: ______.
Analogy:
Ordinary glass:: Glass tumbler.
Pyrex glass:: ______.
