A straw, or a drinking tube, is a cylindrical, hollow plastic product whose main function is to drink beverages in a cup, as well as bone marrow for sucking some long bones of cooked animals. Generally, the diameter is about 0.5cm, but when used for yoghurt, pearl milk tea and other drinks, a thick straw is used, and some have a diameter of 1.5cm. Some less common, very small diameter straws are used as hot drinks.
The straw is based on the principle of atmospheric pressure. When using it, it sucks part of the air against the straw, which will cause the pressure inside the tube to become smaller. In order to balance the air pressure, the atmospheric pressure will force the liquid in the tube to rise. When the inhalation is stopped, the liquid in the tube drops and the pressure returns to equilibrium. This is the wonderful principle and application of the straw.
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