What is the principle that a syringe can draw liquid into the syringe

According to the principle of Disposable sterile syringe atmospheric pressure bai. In the process of inhaling the liquid medicine, when the piston is pulled outwards, the volume of only a small part of the gas in the needle tube zhi increases and the air pressure decreases, while the outside atmospheric pressure does not change, the atmospheric pressure will force the medicine into the needle tube.Syringe is a common medical appliance.

As early as the 15th century, the Italian Catinel proposed the principle of the syringe. The needle is mainly used to draw or inject gas or liquid.The appearance of the syringe is an epoch-making revolution in the field of medical appliances. The process of drawing and injecting gas or liquid with a needle is called injection. The syringe is composed of a needle barrel with a small hole in the front end and a matching piston core rod. It is used to inject a small amount of liquid or into areas that cannot be accessed by other methods or withdraw from those places. When the core rod is pulled out, the liquid Or gas is sucked in from the small hole at the front of the syringe, and the liquid or gas is squeezed out when the core rod is pushed in.

Syringes can also be used for medical equipment, containers, and scientific instruments such as some chromatography methods to inject through the rubber septum. Injecting gas into blood vessels will cause air embolism. The way to remove air from the syringe to avoid embolism is to turn the syringe upside down, tap it gently, and then squeeze out a little liquid before the injection into the bloodstream.Syringes can also be used for medical equipment, containers, and scientific instruments such as some chromatography methods to inject through the rubber septum.

Syringes can also be used for medical equipment, containers, and scientific instruments such as some chromatography methods to inject through the rubber septum. Injecting gas into blood vessels will cause air embolism. The way to remove air from the syringe to avoid embolism is to turn the syringe upside down, tap it gently, and then squeeze out a little liquid before the injection into the bloodstream.In some occasions where accuracy is not the primary consideration for germs, such as quantitative chemical analysis, the glass syringe is still in use due to its small error and smooth plunger movement.