How Is Salinity Calculated?

••• Andrey Nikitin/iStock/GettyImages

Salinity is used to measure the amount of salt in water. This measurement is critical for many marine species because they can only live within a certain salinity range. Salinity varies based on depth and location. For example, the Atlantic Ocean has its highest salinity in the North Atlantic at 35.5 and its lowest in the South Atlantic at 34.5.


Salinity is measured in grams of salt per kilogram of water. For example a salinity of two would mean there were two grams of salt in every kilogram of water.

Salinity vs. Depth

Salinity increases as depth of the water increases because higher concentrations of salt increase the density of water.

Halocline Layer

The halocline layer is found between the surface layer and the deep sea layer of water. This is the level at which the salinity of water rises the fastest.

Electrical Conductivity

The salinity of water can be determined by how easily electricity travels through it. The higher the conductivity the higher the salinity.

Salinity in Aquariums

Many fish require a certain salinity level to live so in fish tanks the salinity level must be kept constant.

Related Articles

Brine Vs. Conductivity
How to Dissolve Sodium Bicarbonate
How to Calculate Water Levels in a Tank
How to Light a Lightbulb With Saltwater
Aquatic Ecosystem Facts
How to Calculate Statistical Mean
Why Is Salt Water Heavier Than Tap Water?
Four Biggest Differences Between the Ocean & Fresh...
How to Convert Moles to Mass in Chemistry
Plants That Live in the Ocean Habitat
How to Make a Five Percent Solution With Salt
How to Find the Number of Representative Particles...
What Color Would a Tester PH Paper Turn if Is Dipped...
How to Increase the Density of Water
Characteristics of a Marine Biome
What Kind of Water Does Shrimp Live In?
How to Calculate Solubilities
How Does Salt Water Make an Egg Float?
The Average Rainfall in a Fresh Water Ecosystem