In two beakers (A and B) 50 ml water of about 70oC each is taken. Then in beaker A,50 ml of water of about 30oC is added and after 5 minutes, in beaker B, 50 ml of water about 30oC is added. What would be observed if the temperature of both beakers are recorded immediately? Why?

Question

In two beakers (A and B) 50 ml water of about 70oC each is taken. Then in beaker A,50 ml of water of about 30oC is added and after 5 minutes, in beaker B, 50 ml of water about 30oC is added. What would be observed if the temperature of both beakers are recorded immediately? Why?

Filo · Accepted Answer

In A since the temperature of water will get down immediately after adding water at 30oC, the difference in temperature between the water in A to the atmosphere is less so heat transfer rate between the beaker A and atmosphere will reduce.Whereas in case of beaker B, the temperature is higher for five minutes so the heat transfer rate from B will be high and then 30oC water is added which reduces the temperature further.So after 5 minutes temperature of B will be less than A.

Question Text	In two beakers ( $A$ and $B$ ) $50 m l$ water of about $7 0^{o} C$ each is taken. Then in beaker $A, 50 m l$ of water of about $3 0^{o} C$ is added and after $5$ minutes, in beaker $B, 50 m l$ of water about $3 0^{o} C$ is added. What would be observed if the temperature of both beakers are recorded immediately? Why?
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