1. In general, rice can be steamed in a pressure cooker for 5 to 10 minutes. However, the specific time has a lot to do with the temperature and the amount of cooking. The more you cook, the longer it takes.

2. Under normal atmospheric pressure, the water can only be boiled to the boiling point of 100 degree with an ordinary pot, and then the temperature of the water will not be higher than the boiling point even if it is heated again. After the water in the pressure cooker is heated and boiled, steam is generated, and the pressure of the steam will gradually increase. According to the principle that air pressure is directly proportional to the boiling point of water, the boiling point of water in the pot keeps rising, so the temperature in the pot also rises, exceeding 100 degrees. In this way, food can be quickly cooked or sterilized by high temperature and high pressure.