NAU Biology BIO 326
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BIO326 : Individual : Environmental Variation : Fluid Densities

Exercise: Fluid Densities

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DUE: 28-Jan-2000 Assignments sent after the due date will receive a grade of zero.

1. When the temperature of a fluid changes, its density changes also. What is the definition of density? What is the density of water at 0o, 4o, 10o, 20o, 30o C, and of ice at 0o C? What source(s) did you use for this information?

2. When lakes and ponds freeze in winter, why does the ice form at the surface of the water? Why does it stay there? What source(s) did you use for this information?

3. In large temperate lakes, there is less primary productivity in summer than in spring in spite of more abundant sunlight in summer. What changes in lake conditions are responsible for this paradoxical situation?

4. What is the relationship between water temperature and water density that leads to the establishment and existence of a thermocline? Explain. What source(s) did you use for this information?


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