What is the principle of paper straws?
The straw uses the principle of atmospheric pressure. When in use, part of the air is sucked away from the straw, which will cause the pressure in the tube to decrease. In order to balance the air pressure, the atmospheric pressure will force the liquid in the tube to rise. When you stop inhaling, the liquid in the tube drops and the pressure returns to equilibrium. This is the wonderful principle and application of straws.
How to choose “green” paper straws?
The first is “look”, to see if the outer tube of the straw is equipped with QS; whether there are black dots, impurities or broken bubbles in the straw, because these are the characteristics of unqualified products. Secondly, it is necessary to “smell”, smell the pungent odor before the straw is in contact with the drink. The third is to squeeze it with your hands. If you squeeze the straw, it will be flat and inflexible. It means that the straw is made of thinner material and is of poor quality. It will also be easily flattened during use.