What is the density of the water?

The density of water is 1000 kg / m³. But clarification is required here — this is the density of pure water at a temperature of 4 ° C. For water, this is the maximum density. In the rest of the temperature range in which water is in a liquid state (0 … 374 ° C), its density is less than 1000 kg / m³. The presence of a maximum density at 4 ° C explains the poor freezing of water bodies. Having cooled to four degrees, the water sinks to the bottom, and colder water does not displace it from there, but continues to freeze.
At a temperature of 100 ° C, water has a density of 993.7 kg / m³. It would seem a small drop in density, but it provides intense convection when heated.