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?

Answer in Brief

L_t – L₀ ∝ L₀
∴ The rod having greater length will expand more when rods are heated to the same temperature.
∴ Rod with 10 m length will expand more.

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Chapter 6: Heat Transfer - Short/long Answer Questions [Page 121]

Chapter 6 Heat Transfer
Short/long Answer Questions | Q 19 | Page 121

One rod of copper and another identical rod of iron are heated to the same rise in temperature. Which rod will expand more? Give reason.

100 ml of each of the following liquid is heated from 10°C to 50°C. Which will expand more : (a) water (b) benzene (c) alcohol?

What is meant by thermal expansion?

Distinguish between a clinical and a laboratory thermometer.

A bimetal strip is shown in the below diagram before heating. Draw a diagram to show how it bends on heating and on cooling.

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Explain thermal expansion with suitable examples.