Why is water drained from the car’s radiator when parked or stored in a cold room in winter?

Freezing point of water = 0 degrees Celsius. In addition, water has a unique property among other substances: when solidified, it first slightly increases its volume V in comparison with the initial volume in the liquid state of aggregation V0. Because of this, if water is left in a car’s radiator at freezing temperatures, it will freeze and destroy the radiator.

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