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.
The density of ultrapure water is not affected.
i get less they when i did you mum
I assume you mean "affect". Water density can be affected by impurities. Assuming the water is pure, it can be affected by temperature, pressure, and isotopic composition.
Temperature and Salinity
expands
Liquid state, nearest to freezing.
Density of a liquid is indirectly proportional to the temperature. When the temperature raises, the density of the liquid decreases. Therefor the temperature has an effect on water density.
The density, freezing point etc. are different compared with pure 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.
Freezing point (more salt the lower the freezing point). Density (more salt, the heavier the water).
I don't know how much it is affected, by yes it is affected. I would say insignificantly though.