Question

15. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be * 80°C or more than 50°C but less than 80°C or 20°C or between 30°C and 50°C​

Answer 1

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.