The density of ice is lower than the density of water.
There is no effect of freezing on the mass of water when it freezes. The thing which is affected by freezing is its volume and hence, it's density.
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Temperature and Salinity
Water properties are affected by factors such as temperature, pressure, impurities, pH level, and presence of dissolved minerals. These factors can influence the density, freezing point, boiling point, and pH of water, as well as its ability to dissolve other substances and its surface tension.
The density, freezing point etc. are different compared with pure water.
Freezing point (more salt the lower the freezing point). Density (more salt, the heavier the water).
This means that the density of ice is lower than that of water. Its significance is that the density of ice decreases when water undergoes freezing. As density is equal to mass per unit volume, thus this means that there is an increase in volume due to expansion during the freezing process.
An explanation is that during freezing the structure of the ice is modified.
As altitude increases, the air pressure decreases. This results in lower boiling points for water because there is less atmospheric pressure pushing down on the water. However, the freezing point of water is not significantly affected by altitude.
Factors that can affect the density of water include temperature, pressure, and the presence of impurities. As temperature decreases, water becomes denser until it reaches its maximum density at 4°C. Increasing pressure will also increase the density of water. Impurities, such as salt, can also alter the density of water by changing its composition.
In warm temperature water enlarges, but in cold temp it becomes more dense reaching maximum density at 4 degrees Celsius it then begins to expand again as it reaches freezing point (0 deg. C). This is why ice floats.
Pool plaster in generally not affected by cold water, cold water above freezing of course.