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Syringes can also be used in medical equipment, containers, scientific instruments such as some chromatography through the rubber diaphragm injection. Injecting gas into the blood vessel can cause air embolism. The way to remove air from the syringe to avoid embolism is to invert the syringe, gently knock, and then squeeze out a little liquid before it is injected into the bloodstream. In some cases where the precision is not the primary consideration of the pathogen, such as quantitative chemical analysis, the glass injector is still in use because of the small error of the glass injector and the smooth movement of the push rod. You can also inject some juice into the meat to improve the flavor and texture of the meat, or inject it into the pastry during baking. The injector can also add ink to the cartridge.