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why does water expand on cooling between 4°C-0°C?

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why does water expand on cooling between 4°C-0°C I mean by rule substances should contract right on cooling but what makes water exceptional ??
asked Mar 12, 2015 in Heat and Thermodynamics by aparna (180 points)

2 Answers

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This is due to anomalous expansion of water.

Read at the following links

http://www1.lsbu.ac.uk/water/water_anomalies.html

https://www.youtube.com/watch?v=UruJTUaU18Q

 

 

answered Mar 13, 2015 by admin (4,920 points)
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this is because cooling below 4 degree celcius , ice starts to form .  as this happens , h2o molecules move away from aech other to form a hexagonal structure as in ice .  as a result of this expansion 9% volume is increased .
answered Apr 2, 2017 by rizwanasghar (140 points)

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