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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.
As a result, temperature and pressure can greatly affect the volume of a substance, especially gases. As with mass, increasing and decreasing the amount of material also increases and decreases the volume of the substance. Density. Density is calculated by dividing the mass by the volume (density = mass/volume). For example, 10 grams of freshwater has a volume of 10 milliliters. This results in a density of one gram per milliliter (10 g Ã· 10 mL = 1 g/mL). Unlike mass and volume, increasing the amount of material measured does not increase or decrease density.