A method for generating pressure by a spark, comprising the steps of:
- applying a predetermined spark voltage between a fixed electrode disposed in a pressure chamber containing a non-compressive fluid and a movable electrode, disposed in the pressure chamber, separated from the fixed electrode at a predetermined distance, and comprising a permanent magnet disposed thereon;
- applying a current to an electromagnet disposed in a main device disposed adjacent to the pressure chamber and configured to apply a magnetic force to the permanent magnet to move the movable electrode toward the fixed electrode via the permanent magnet to generate a spark between the movable electrode and the fixed electrode;
- and
- transferring pressure generated in the non-compressive fluid by the spark to the outside of the pressure chamber via a pressure transferring structure.