1. A solution in which voltage is converted into fluid pressure by the streaming of the potential effect.
2. A type of solion for converting voltage into fluid pressure, which uses depolarizing electrodes sealed in an electrolyte and which operates through the streaming potential effect.

A solion is an electrochemical device in which amplification is obtained by controlling and monitoring a reversible electrochemical reaction or a low-frequency amplifying device that operates by controlling the flow of ions in a solution; some types, such as, the micropump, accomplish this by means of an electro-osmotic pressure.