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Since this one has more marbles for each box part (4) than the first one (3), we can say that the second one is DENSER. Salinity adds to mass (no. of marbles) but not to the volume (size of box). Thus, the more salinity, the denser. Temperature may also affect water density. When the temperature is high, molecules in water disperse and move around more rapidy than they usually do in order to spread the heat energy.
PROPERTIES OF SEAWATER. Temperature, pressure, and salinity are the three most important properties of seawater, and they determine the other physical properties associated with seawater. This differs from pure water, where only pressure and temperature determine the physical properties. Wave motion and the presence of small suspended particles in seawater are also important variables that affect the properties of seawater. Wave motion causes a change in the processes of chemical diffusion, heat conduction, and transfer of momentum from one layer to another.