The most critical operation when using an autoclave --- exhaust the inside air

In the heating process,If there is air in the autoclave, the pressure shown by the barometer is not the pressure produced by saturated steam.

At the same pressure, the temperature of the steam mixed with air is lower than that of the saturated steam.

In the cooling process, if the pressure is not reduced to 0, open the autoclave exhaust valve, the pressure in the autoclave pot will suddenly drop, so that the items in the container are rushed out due to the imbalance of internal and external pressure.