Question

→One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be


(a) 80°C
(b) more than 50°C but less than 80°C

(c) 20°C
(d) between 30°C and 50°C​

Answer 1

Explanation:

the temperature will slightly less than 40°C. Explanation: Because water expands when heated, 1 litre of water at 50°C will have less mass than 1 litre of water at 30°C. As a result, the 30°C litre has slightly more than the 50°C litre, and thus the average will end up slightly less than 40°C.

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Answer 2

Answer:

option d

Explanation:

Let's put down another calculation.

At T1 = 50° C, water density is 988.063 kg/m3 or its mass m1 = 0.988063 kg per lt

At T2 = 30° C, water density is 995.678 kg/m3 or its mass m2 = 0.995678 kg per lt

(http://www.csgnetwork.com/h2odenscalc.html)

Then the temperature of the mixture is:

T = (T1*m1+T2*m2) / (m1+m2) = 39.96° C