The density of seawater varies depending on temperature, salinity, and pressure

 The density of seawater varies depending on temperature, salinity, and pressure: 

Surface seawater: The density of surface seawater ranges from 1020 to 1029 kg/m3. For example, at a temperature of 25 °C, salinity of 35 g/kg, and 1 atm pressure, the density of seawater is 1023.6 kg/m3. 

Deep ocean: Under high pressure, seawater can reach a density of 1050 kg/m3 or higher. 

Average density: The average density of the ocean is 1.03 g/cm3. 

Seawater is denser than fresh water, ranging from 24-28 kg/m3 denser