What is the SG of saltwater?
- What is the SG of saltwater?
1.026
- What is Hyposalinity?
Kemmer/Getty Images. Hypo means "lower than normal" and saline/salinity "containing salt," therefore hyposalinity in simple terms means a lower than normal amount of salt is contained in the seawater. 1 The salinity of seawater can be measured as Specific Gravity (SG) using a hydrometer or refractometer.