Aluminum electrolytics have very high volumetric efficiency, indicating a high capacitance times voltage (CV) factor for their physical size in comparison to ceramic, mica and the various polymer film capacitors. Tantalum and niobium electrolytics are other parts with somewhat higher volumetric efficiency but are more expensive, generally have had longer lead times, and some will say lower reliability. This video and the related article will concentrate on aluminum electrolytic parts due to their low cost, wide and consistent availability, and their use in very large numbers in consumer, industrial, automotive and even military electronics. Read more at https://electronics360.globalspec.com/article/17744/leakage-current-in-electrolytic-capacitors