The average salinity of the oceans is _______ parts per thousand.

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SSC MTS (2022) Official Paper (Held On: 19 Jun, 2023 Shift 2)
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  1. 35
  2. 55
  3. 45
  4. 25

Answer (Detailed Solution Below)

Option 1 : 35
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Detailed Solution

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The correct answer is 35.

Key Points

  • The average salinity of seawater is about 35 grams per kilogram (g/kg) of seawater, or 35 ppt.
  • Seawater generally ranges from 33 ppt to 38 ppt. Freshwater lakes, rivers, and streams contain some dissolved matter—1 ppt or less.
  • Brackish water is a mixture of fresh water and seawater, below approximately 33 ppt.
  • Hypersaline water, or brine, is very salty seawater, above approximately 38 ppt.

Additional Information

  • Salinity, which is measured in parts per thousand (ppt), is the amount of salt in grams per kilogram of saltwater.
    • The number of parts, or grams, of salt there are per thousand parts, or kilogram (1,000 g), of seawater is known as parts per thousand.
    • The term "parts per thousand" (ppt) is frequently used. 
    • Both temperature and salinity affect density.
    • A hydrometer can be used to determine the density of a liquid by measuring the level at which the hydrometer floats in it.
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