Which of the following is a common dry heat sterilization method?

The hot air oven is a recognized method of dry heat sterilization. This process typically involves using hot air that is circulated in the oven to achieve the sterilization of items at elevated temperatures, usually between 160°C to 180°C, for a specific period. The principle behind dry heat sterilization lies in the oxidation of cell components and denaturation of proteins, which effectively kills microorganisms.

The method is particularly suitable for sterilizing glassware, oils, and powders that may be compromised by moisture, making it an essential technique in laboratories. This contrasts with the autoclave and steam sterilizer methods, which utilize moist heat to achieve sterilization through steam under pressure — not considered dry heat. Cold sterilization involves the use of chemical agents to sterilize equipment and does not involve heat at all, further distinguishing it from the hot air oven method.