No more than 4/5 of the volume
The water in the pressure cooker should not be less than 1/5 of the volume of the inner tank, and the maximum should not exceed 4/5 of the volume to be safe. There are certain regulations on food. The food placed in the pressure cooker should not exceed the highest water level in the pot. Pressure cooker, also called pressure cooker, pressure cooker, is a kitchen pot. A pressure cooker increases the physical phenomenon of the boiling point of liquid under higher pressure, allowing the water to reach a higher temperature without boiling, thereby speeding up the efficiency of stewing food. It can be used to heat steamed food to more than 100℃. In high altitude areas, using a pressure cooker can avoid the problem of lowering the boiling point of water and making it difficult to cook food.
At first people used to call the pressure cooker the "Paping Pot" because it was invented by Dr. Papin.
Papin was one of the early pioneers in the development of steam engines. Born in Blois, France in 1647, he later came to London, became Robert Boyle's assistant, and entered the Royal Society.
Papin is both a physicist and a mechanical engineer. In his research, he discovered that the air pressure is directly proportional to the boiling point of water. So he designed and made a sealed container, filled it with water and heated it. As the water temperature increased, the pressure in the container increased, and the boiling point of water also increased. Water must exceed 100°C to If you turn it on, the food will cook faster. This was the first pressure cooker made by Papin.
How to use a pressure cooker
Inspection and oiling
If you use a new pressure cooker, the sealing ring is very elastic, so it is not easy to open. At this time, take cooking oil and apply it evenly on the pot body to make it easy to open. Secondly, before use, check whether the exhaust pipe is smooth and whether the safety valve is perfect. Clean the pot before use and clean it immediately after use.
Put the right amount of food
When putting food in the pressure cooker, don’t put too much. Generally, it should not exceed four-fifths of the capacity of the pressure cooker, but if it is food that easily expands, it should be reduced appropriately and add an appropriate amount of water. If you put too much food, it is easy to create pressure and block the safety valve. This is very dangerous.
Close the lid correctly
When closing the lid, check whether the float is in the correct position up and down, pay attention to whether the pot lid corresponds to the seal of the pot lid, and break it off The lid is opened at the completely overlapping mark position and cannot be opened.
Heating
Generally, when starting to heat, use high fire. When you see a large amount of steam emitting from the exhaust hole, you can adjust the firepower appropriately, otherwise the exhaust hole will not be able to catch up with the exhaust. The pressure in the pot is too strong. At the same time, pay attention to the time. Do not heat it for a long time to prevent it from drying out.
Open the lid after deflating.
After cooking, the pressure cooker needs to cool for a long time before opening the lid. If you need to speed up the opening of the lid, pour cold water on its surface to lower the temperature, open the pressure limiting valve to discharge the gas, and the lid can be opened smoothly.
Precautions for using the pressure cooker
1. Before use, check whether the ventilation hole of the pot lid is unobstructed and remove any rice grains or food debris remaining in the hole. Only when the upper and lower handles are completely overlapped can the ignition be started.
2. Serve food according to the manufacturer's instructions and do not exceed the amount. Be sure not to exceed 4/5 of the pressure cooker capacity.
3. Do not close the pressure limiting valve immediately after adding the cap. You should wait until the food is boiled and water vapor is discharged from the exhaust hole in a straight line and makes a sound before you can close the pressure limiting valve. Do not touch the pressure valve during use, and do not put heavy objects on the pressure valve or open the pot lid.
4. When heated to a certain level, the pressure limiting valve will be slightly lifted by the high-pressure air flow, and at the same time, air will be released from the pores on both sides, and a "shh, ssh, ssh" sound will be emitted. At this time To weaken the fire, keep the pressure-limiting valve in a non-rising state, or extinguish the fire directly.
5. Do not use a pressure cooker when cooking beans, porridge and other foods. The center hole and the air supply hole of the pressure limiting valve are enough to be blocked by the foam generated in the pot.
6. When using a pressure cooker to cook food, someone must supervise it.