Stainless steel is resistant to water due to its high chromium content. Chromium is a metal that forms a thin, invisible layer of chromium oxide on the surface of the stainless steel when it is exposed to oxygen, forming a barrier that prevents corrosion and staining. This oxide layer is self-repairing, meaning that if it is scratched or damaged, it will regenerate itself and maintain the protection against water.

Additionally, stainless steel contains other elements such as nickel and molybdenum that further enhance its resistance to corrosion and help maintain its structure and strength.