How does vapor form a mirror?

Vapor can form a mirror through a process called condensation, where water vapor in the air cools and transitions into liquid droplets on a surface. When these tiny droplets accumulate on a surface, they create a reflective layer that can resemble a mirror. This is often seen in bathroom mirrors after a hot shower, where the warm, moist air causes condensation on the cooler glass surface, producing a temporary reflective effect. The quality of the "mirror" depends on the uniformity and thickness of the condensed water layer.