Originally, a "strong electrolyte" was defined as a chemical compound that, when in aqueous solution, is a good conductor of electricity.
With a greater understanding of the properties of ions in solution, its definition was replaced by the present one.
A concentrated solution of this strong electrolyte has a lower vapor pressure than that of pure water at the same temperature.
Strong electrolytes conduct electricity only in aqueous solutions, or in molten salt, and ionic liquid.
The strength of an electrolyte does not affect the open circuit voltage produced by a galvanic cell.