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Take 100 ml of water at 90°C and 200 ml of water at 60°C and mix the two. What is the temperature of the mixture? What difference do you notice in change of temperature?

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The temperature of mixture is 70°C. The reason is here m1 = 100 gm ; m2 = 200 gm

T1 = 90°C; T2 = 60°C (∵ for water 1 ml = 1 gm)

The temperature of mixture T 

Final temperature of the mixture is less than the above case. 

If the quantity increases, the quantity of heat to transfer is also rises to attain thermal equilibrium. 

Here hotter body quantity is less and colder body quantity is high. So, the temperature at thermal equilibrium decreases and stands at 70° C.

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