Which device is used to disinfect surfaces but does not effectively sterilize?

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Ultraviolet devices disinfect surfaces by using UV-C light to inactivate microorganisms, meaning they prevent those organisms from reproducing and spreading. This works quickly and is great for reducing surface contamination. However, sterilization means killing every microorganism, including hardy spores, and UV light can’t guarantee that. It only treats what is directly exposed to the light; shadows, crevices, and opaque materials can shield microbes, and spores are notably resistant to UV.

In contrast, an autoclave uses high-pressure steam to physically destroy all microorganisms, including spores, achieving true sterilization. Boiling water can kill many pathogens but may not destroy spores, so it isn’t a reliable sterilization method. Steam cleaners use steam to clean and sanitize, but they’re designed for disinfection rather than guaranteed sterilization.

So, the device that disinfects but does not reliably sterilize is the ultraviolet-based system.