derive the relation of Q=MS∆t
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having exam tomorrow
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Answers
Answer:
Procedure :
1) Take 250 ml of water in one beaker and 1 litre of water in another beaker.
2) Note their initial temperatures.
3) Now heat the two beakers up to 60° C.
4) Note down the heating time.
Observation:
1) We observe that the water in large beaker takes more time.
2) That means we need to supply more heat energy to water in larger beaker (greater quantity of water).
Conclusion:
From this we conclude that for some change in temperature the amount of heat (Q) absorbed by a substance is directly proportional to its mass.
Q oc m (when AT is constant) ...... (1)
Procedure:
Now take 1 litre of water in a beaker and heat it and note the temperature changes (AT) for every two minutes and observe the rise internals.
Conclusion:
We will notice that for the same mass (m) of water the change in temperature is proportional to amount of heat (Q) absorbed by it.
Q oc AT (when m is constant). .......(2)
From (1) and (2)
Q c mAT (or) Q mSAT
where 'S' is called specific heat of substance.