Question

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Activity 4.11
Fill the two cans used in Activity 4.10
with the same amount of hot water at
the same temperature (say, at 60°C).
Leave the cans in a room or in a shade.
Note the temperature of water after
10-15 minutes. Does the temperature
of water in both the cans fall by the same
amount?
​

Answer 1

Answer:

Activity 4.1

Take three large mugs. Label them as A, B and C. Put cold water in mug A and hot water in mug B. Mix some cold and hot water in mug C. Now dip your left hand in mug A and the right hand in mug B. After keeping the hands in the two mugs for 2–3 minutes, put both the hands simultaneously in mug C (Fig. 1). Do both the hands get the same feeling?

Make sure that water is not so hot that you burn your hand

Fig. 4.1 Feeling water in three mugs

Boojho says,“My left hand tells me that the water in mug C is hot and the right hand tells me that the same water is cold. What should I conclude?”

Boojho’s confusion shows that we cannot always rely on our sense of touch to decide whether an object is hot or cold. Sometime it may deceive us.

Then, how do we find out how hot an object really is? A reliable measure of the hotness of an object is its temperature. Temperature is measured by a device called thermometer.

Explanation:

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Answer 2

Answer:

Explanation:

no