Question

electrical conductivity readings at a known temperature measure
multiple choice
salinity
temperature
pressure
viscosity
density

Explanation:

Salinity affects electrical conductivity. Dissolved salts in a solution increase the number of ions, which carry electric current. At a known temperature, electrical conductivity readings can be used to measure salinity. Other options like temperature (already known), pressure, viscosity, and density do not have a direct relationship with electrical - conductivity readings in the context of this question for measurement purposes.

Answer:

salinity