Final answer:
The minimum effective pressure required when sterilizing instruments is typically 15 to 20 psi for a table-top gravity air-displacement sterilizer.
Step-by-step explanation:
The standard operating pressure required when sterilizing instruments in a table-top gravity air-displacement sterilizer is typically 15 to 20 pounds per square inch (psi). This pressure is necessary to ensure that the steam can reach the required temperature for effective sterilization. The length of exposure time may vary, but it is typically 20 minutes or longer depending on the volume and nature of the material being sterilized. It is important to note that the pressure and temperature settings may vary depending on the specific sterilizer being used.