Question

1l of water at 30 degree celsius is mixed with 1lof water at 50 degree celsius. 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:

Answer: 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.

Answer 2

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Answer: 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.