A straw is a type of tube used to suck reagents, which uses plastic as the raw material. The straw is widely used in the experimental process, and its function is to suck a small amount of liquid into other containers.

Visually speaking, a straw is a glass tube that is stretched thin at one end. Its capacity is suitable for the transfer of small amounts of liquid. On the other end, there is a latex head that can control the amount of liquid absorbed. The principle is to use the principle of atmospheric pressure. When using it, a portion of the air is sucked away from the straw. Various straws will cause the pressure inside the straw to decrease, and in order to balance the pressure, the atmospheric pressure will force the liquid inside the straw to rise. When the squeezing stops, the liquid inside the tube decreases and the pressure returns to equilibrium.

When using a straw, attention should be paid to dropping the liquid vertically and in the air, and it should not be attached to the test tube or other utensils (except for certain specific requirements). And during use, the solution must not be sucked into the latex head to avoid contamination of the latex head

After use, if there is no substance that is particularly difficult to remove adhering to the straw wall, it can be cleaned and dried before continuing to use. Conversely, if the straw wall is found to be difficult to remove, it should be discarded. When placing straws, they should not be placed randomly on the table to avoid contamination and rolling off.