Straight neck safety funnel is a ball-shape funnel with a cuffed top which can improve the mechanical strength. The bottom end is connecting a long glass tube for inserting into the bottom of the equipment and adding liquid. When using it, attention that the bottom of the funnel must be below the surface of liquid. This is to avoid the produced air leaks out from the long neck funnel and seal the liquid. The long neck funnel can be used when producing carbon dioxide and oxygen in laboratory. Matters need attention: Cleaning up must be done after experiment to prevent drug residue from remaining leading to deviation for the next experiment.
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