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

  1. 80°C (b) more than 50°C but less than 80°C
  2. 20°C (d) between 30°C and 50°C



Heat flows from objects at higher temperatures to objects at lower temperatures .

  • When the two are mixed, heat will flow to 30°C water from 50°C water .
  • So the 50°C water will lose heat (reduce temperature), while 30°C water will increase in temperature .

So, the correct answer is (d) The temperature of the mixture will be between 30°C and 50°C.

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo