An autoclave uses moist heat at what temperature to achieve sterilization?

An autoclave uses moist heat at what temperature to achieve sterilization?

• A. Ultraviolet light
• B. Moist heat at 121°C (250°F)
• C. Dry heat
• D. Chemical vapors

Answer: (B)

Moist heat under pressure is what makes autoclave sterilization effective. Steam transfers heat rapidly and, when enclosed under pressure, raises the boiling point so the items reach a higher temperature without the steam escaping. The standard condition used to achieve sterilization is 121°C (250°F) under about 15 psi, typically for around 15–20 minutes, depending on the load. This combination reliably inactivates most microorganisms, including spores, by denaturing proteins and disrupting essential cellular structures. Ultraviolet light sterilizes surfaces exposed to it but cannot penetrate many materials or reach wrapped instruments, so it isn’t sufficient for full sterilization in many cases. Dry heat requires much higher temperatures and longer exposure times and works differently, making it less practical for many medical items. Chemical vapor sterilization uses different chemistry and equipment, not the moist-heat autoclave process.

Moist heat under pressure is what makes autoclave sterilization effective. Steam transfers heat rapidly and, when enclosed under pressure, raises the boiling point so the items reach a higher temperature without the steam escaping. The standard condition used to achieve sterilization is 121°C (250°F) under about 15 psi, typically for around 15–20 minutes, depending on the load. This combination reliably inactivates most microorganisms, including spores, by denaturing proteins and disrupting essential cellular structures.

Ultraviolet light sterilizes surfaces exposed to it but cannot penetrate many materials or reach wrapped instruments, so it isn’t sufficient for full sterilization in many cases. Dry heat requires much higher temperatures and longer exposure times and works differently, making it less practical for many medical items. Chemical vapor sterilization uses different chemistry and equipment, not the moist-heat autoclave process.