The average salinity of sea water is________?
Correct answer: B. 3.5%
- A. 3%
- B. 3.5%
- C. 2.5%
- D. 2%
Explanation
Average seawater contains about 3.5% dissolved salts by mass, commonly expressed as approximately 35 parts per thousand. Students may choose 3% because salinity varies between seas, but 3.5% is the accepted average value.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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