Grade 8Physical Chemistry
Please explain Change in density of water if water is freezed further below 0°C to -10°C.
Please explain Change in density of water if water is freezed further below 0°C to -10°C.
1 Answer
Shubhanshi Asati
Water at ordinary temperatures contracts and increases in density as it is cooled, like most substances. But at about 4°C it reaches a maximum density and then decreases in density as it approaches the freezing point. This decrease in density is only about one part in 10,000 as it cools from 4°C to 0°C, but this is sufficient to cause the water near freezing to come to the top. The water further expands upon freezing, so that water freezes from the top down, and ice floats on water.
The expansion upon freezing comes from the fact that water crystallizes into an open hexagonal form. This hexagonal lattice contains more space than the liquid state.
Thus, the density of water decreases below 0-degree Celsius to -10-degree Celsius.
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