State the volume changes observed when a given mass of water is heated from 0 ∘ C t o 10 ∘ C . Sketch temperature-volume graph to show the behaviour.

In the case of fluids, with the rise of temperature, the volume increases. Therefore, the density decreases. But, water shows an anomalous behaviour, as it contracts on heating between the temperature 0 ° C to 4 ° C . When water is heated above 0 ° C , the volume of given amount of water decreases until its temperature reaches to 4 ° C . The volume decreases and hence density increases. So, it is clear that water has minimum volume and hence maximum density at 4 ° C . The volume-temperature graph given below shows this.

E M B I B E

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 10

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IMPORTANT

Earn 100

What do you mean by anomalous expansion of water?

Important Questions on Heat and Energy

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IMPORTANT

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 11

At what temperature the density of water is maximum? State it's value

HARD

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IMPORTANT

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 12

State the volume changes observed when a given mass of water is heated from

0^{\circ} C t o 10^{\circ} C

. Sketch temperature-volume graph to show the behaviour.

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IMPORTANT

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 13

Draw a graph to show the variation in density of water with temperature in the temperature range

0^{\circ} C t o 10^{\circ} C

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Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 14

A given mass of water is cooled from

10^{\circ} C - 0^{\circ} C

. State the volume changes observed.Represent these changes on a temperature-volume graph.

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Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 15

Describe an experiment to show that water has maximum density at 4°C. What important consequences follow from this peculiar property of water? Discuss the importance of this phenomenon in nature.

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IMPORTANT

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 16

A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer

(i) Just in contact with the ice.

EASY

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IMPORTANT

Concise Physics I.C.S.E Part I For Class 9>Chapter 6 - Heat and Energy>EXERCISE–6(A)>Q 16

A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer

(i) at the bottom of pond.