Question

If temperature decrease below ____°C water start expanding and water became lighter due to decrease in density . it moves upward in the cylinder and the temperature of upper part of water column decrease to 0°C

Answer 1

100 degree Celsius ,,,, but the temperature should be increased not decreased

Answer 2

Answer:

The concept is based on the effect of temperature on density.

Explanation:

In case of water has maximum density at 4 degree celcius, it means at 4 degree celcius, the hydrogen bond is at its smallest length and allow the water molecules to move close to each other resulting in maximun density.  

If the temperature goes below 4 degree celcius, the hydrogen bonds become weaker and the water molecules begin to drift apart, results in decrease in density. this allows the the movement of water in the upward direction and deceases the water column to 0 degree celcius.

Hence, the correct answer is 4 degree celcius.

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