Question
Download Solution PDFThe average salinity of the oceans is _______ parts per thousand.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 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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