Question

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

Answer 1

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.