1. High pressure steam is the most effective sterilization method, which can quickly achieve complete sterilization. Generally, under the pressure of 15 lbs/in2 (12 1.6℃) and15 ~ 30 minutes, all microorganisms including spores can be killed.

2. The pressure cooker does have high temperature and high pressure, but it can't meet the standard of laboratory high temperature sterilizer. Therefore, after cooking in the pressure cooker, only bacteria and some microorganisms are killed, but bacterial spores cannot be killed.

3. Bacterial spores will be dormant in harsh environment. After being placed in the pressure cooker and cooled, the environment is closed, humid and rich in organic matter, which is the best environment for bacterial growth. The spores will regain their vitality and multiply rapidly, so the rice will go bad.

4. The pressure of the pressure cooker is 15 lbs, and it can kill hepatitis B virus when it is heated to 12 1℃ and maintained for10 ~15 minutes. You can also use a domestic pressure cooker to cook for 20 minutes after the valve is vented. This method is the most thorough method to eliminate hepatitis B virus.