Why stainless steel is waterproof?

Stainless steel is considered waterproof due to its non-porous surface, which prevents water and moisture from penetrating the material. Its composition, primarily iron, chromium, and nickel, forms a passive layer of chromium oxide that protects against corrosion and rust, further enhancing its resistance to water damage. This durability makes it suitable for a wide range of applications, including kitchenware, medical instruments, and outdoor structures.