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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.
A unique property of water is that its density increases at 4Â°C (39Â°F), just before it hits. freezing temperature. This causes water at this temperature to sink to the bottom of the. pond or lake. When water molecules do freeze, the ice is less dense than the 4Â°C water, causing it to float on the surface. The differences in density start mixing the top and. bottom layers of water. This mixing of the water layers as air temperatures become. colder is called fall turnover (Fig. 1).