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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.
The difference in density of cold water versus density of warmer water is responsible for ocean currents and upwelling. Warm seawater floats and cold (4Â°C), dense (1 g/cm3), seawater sinks, so ocean temperatures also vary across the surface and into the depths.he Ocean and Temperature. Temperature and density share an inverse relationship. As temperature increases, the space between water molecules increasesâalso known as density, which therefore decreases. If the temperature of water decreases its density increases, but only to a point.