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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.
In addition to all the molecular motions, in liquid water there is a continuous exchange of hydrogens between water molecules-about one exchange per millisecond at a neutral pH of 7.0 and more rapidly when the pH departs from neutrality. Water provides the standard for density at 1 gram/cm 3. While water may seem to be an ordinary liquid, its properties are in many ways unusual. The changes in the properties of water near its freezing point are illustrated below with sketches adapted from Debenedetti and Stanley.