The freezing point of pure water is 0 °C or 32 °F.

The salinity of seawater decreases its freezing point. This is because salt ions interfere with the formation of ice crystals.

The freezing point of seawater with a salinity of 35 ppt is -1.8 °C or 28.8 °F.

The pressure of seawater increases its freezing point. This is because pressure makes it more difficult for water molecules to form ice crystals.

The freezing point of seawater at a depth of 1000 meters is -2.1 °C or 28.2 °F.

Seawater freezes at a lower temperature than pure water because it contains salt. Salt ions interfere with the formation of ice crystals, which makes it more difficult for seawater to freeze.

The freezing point of seawater in the Arctic Ocean is -1.8 °C or 28.8 °F.

The freezing point of seawater in the Antarctic Ocean is -2.1 °C or 28.2 °F.

The freezing point of seawater decreases with increasing latitude. This is because the salinity of seawater increases with increasing latitude.

The freezing point of seawater at the equator is -1.8 °C or 28.8 °F.

The freezing point of seawater increases with increasing depth. This is because the pressure of seawater increases with increasing depth.

The freezing point of seawater at a depth of 5000 meters is -2.3 °C or 27.9 °F.

It is important to know the freezing point of seawater to predict the formation of sea ice, to design ships and submarines that can operate in cold waters, and to understand the behavior of marine organisms in cold waters.

The salinity, pressure, and temperature of seawater can all vary significantly, which can make it challenging to measure the freezing point of seawater accurately.

The freezing point depression method, the cryoscopic method, and the differential scanning calorimetry method are all used to measure the freezing point of seawater.