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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.
This causes the molecules to spread apart, which means that there are fewer molecules are in a given volume and the substance's density decreases. As temperature decreases, the molecules move more slowly, so they collide less and take up less space and the substance's density increases. Water has a density of 1,000 kilograms per cubic meter at 4 degrees Celsius and a density of 958.4 kilograms per cubic meter at 100 degrees Celsius.