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The resulting 'Knudsen salinities' are expressed in units of parts per thousand (ppt or ‰). The use of electrical conductivity measurements to estimate the ionic content of seawater led to the development of the scale called the practical salinity scale 1978 (PSS-78). [9] [10] Salinities measured using PSS-78 do not have units.
The salinity in isolated bodies of water can be considerably greater still – about ten times higher in the case of the Dead Sea. Historically, several salinity scales were used to approximate the absolute salinity of seawater. A popular scale was the "Practical Salinity Scale" where salinity was measured in "practical salinity units (PSU)".
The "practical salinity unit" is effectively not motivated in the article since it completely lacks any reference to physical salinity. The statement "It is not the case that a salinity of 35 exactly equals 35 grams of salt per liter of solution." only says that PSU is not equal to grams per liter.
The handling of salinity was one of the novelties in TEOS-10. It defines the relationship between Reference Salinity and Practical Salinity, Chlorinity or Absolute Salinity and accounts for the different chemical compositions by adding a regionally variable 𝛿SA (see Figure). [7]
Annual mean sea surface salinity, measured in 2009 in practical salinity units [14] Vertical differences in sea salinity between the surface and a depth of 300 metres. Salinity increases with depth in red regions and decreases in blue regions.
A U.K. woman had her breast cancer detected through AI after a routine mammogram came back as normal. Experts Drs. Nicole Saphier and Harvey Castro discuss the power of AI in cancer care.
A salinometer. A salinometer is a device designed to measure the salinity, or dissolved salt content, of a solution.. Since the salinity affects both the electrical conductivity and the specific gravity of a solution, a salinometer often consist of an ec meter or hydrometer and some means of converting those readings to a salinity reading.
Sweeping deportations pledged by President-elect Donald Trump could pose an economic shock for the restaurant industry in ways that echo the pandemic: pricier menus, rising wages, and shuttered ...