Will the pressure decrease when the ampoule of freeze-dried substance is opened?

Because the pressure drops when opening the ampoule of freeze-dried substances, some freeze-dried substances may overflow when opening the ampoule of freeze-dried substances, so it should be operated in the biosafety cabinet.

Biosafety cabinets should be located in places where the flow of people, goods and air may be disturbed. 30cm space should be left on the back and each side of the safety cabinet as far as possible to facilitate the maintenance of the safety cabinet. There should be a space of 30-35cm above the safety cabinet to accurately measure the speed of air passing through the exhaust filter and facilitate the replacement of the exhaust filter.

Open, Chinese vocabulary. Pinyin: kāi qǐ means to open, start from a certain point, etc. It can also be understood as the steps for a certain device to start or start running.

Freeze-dried substances are also called sublimation drying. A drying method in which water-containing materials are frozen below freezing point to convert water into ice, and then the ice is converted into steam under high vacuum and removed. The material can be frozen in a freezer first and then dried.

But it can also be frozen directly in the drying room by rapid vacuum pumping. The water vapor generated by sublimation is removed by the condenser. The heat of vaporization required in the sublimation process is usually provided by thermal radiation.

Ampoule/Ampoule is a small glass container for liquid medicine, with a capacity of 1 ~ 25ml. Commonly used for storing drugs for injection, vaccines, serum, etc. , also used for packaging oral liquid. However, it is not popular because it is difficult for consumers to open it and it is easy to cause accidents.