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Due to anamolous expansion of water, it has ability to decrease its density when cooled below 0 C. As density of ice is less than water, it start to freeze from top to bottom .


When you mix water and NaCl together, you create a solution which melting temperature is lower than 0°C (say around -10°C, depending on the amount of salt. When you put salt on a frozen road during winter, the air temperature can be between 0 and -10 degrees, in this case the mixture of ice and salt melts, because the exterior temperature is above the ...

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