In laboratory operation, various chemicals, chemical reagents, biological reagents, instruments and equipment are used every day. Under some experimental conditions, they will also suffer from injuries such as high temperature, low temperature, high pressure, vacuum and radiation sources. Especially, when using gas, the storage of gas is improperly placed, such as poisoning, explosion and other potential dangerous situations caused by gas leakage due to flat or upside down cylinders, gas valves not being overhauled for a long time. Let's understand the taboo of gas!