Answer:
Refraction OF LIGHT
Step-by-step explanation:
Salinity can be measured in various ways. Most oceanographers
measure salinity with an instrument called a CTD, named for the three
parameters it measures: conductivity, temperature, and density. To
determine salinity, probes on the CTD record electrical conductivity.
SOURCE OF ANSWER:
Desktop CTD instruments are also available, but when the
highest precision isn't necessary for lab settings, a much simpler tool
called a refractometer is used.
A refractometer measures salinity based on refraction. Refraction is the
bending of light that occurs within a water sample. Only a few drops of
water are placed under the light source of the handheld refractometer.