Presumably, many girls have had the experience of finding boys to help screw the bottle cap, even me. However, some people will wonder, screwing a bottle cap does not take much effort, why go to a boy to help unscrew it?
Every time I see a girl asking a boy to help screw the bottle cap, I don't want to break her. Was that the end of the bottle screwed? What difficulties can girls usually be difficult when they open the courier? Three, four, five divided by two will be dismantled, will not open a bottle cap?
In fact, this is not always the case.
Some girls do take the initiative to talk to boys and pretend not to open the bottle cap, while some girls really can't open the bottle cap.
You know, our common plastic bottle cap is a thread design, the inside of the bottle cap groove and the bottle mouth thread in close contact with each other, to provide pressure for the sealing surface, can play a sealing role. To unscrew the bottle cap, it is necessary to achieve the goal by rubbing the finger and the side lines of the bottle cap longitudinally.
The strength required to unscrew the bottle cap has a special measurement index, this indicator is called torque, for different bottles, the torque of unscrewing the bottle cap is also inconsistent, such as carbonated drinks, because the internal closed air pressure is relatively large, the bottle cap will be more important than the general mineral water, according to the relevant paper survey, we can understand that some common bottle cap loosening torque is 1.09 ~ 1.51 range, We can also understand that 10 percent of the torque percentage of adult women is less than 0.92, which means that 10% of girls who want to unscrew a bottle of Coca-Cola can't do it, while other bottles with a larger loosening torque will only have more girls who can't unscrew the cap.
Like the thread design of the thermos bottle we usually drink water, the thermos not only has a relatively high torque, but also because the water cools the pressure inside the bottle becomes lower, and the pressure inside the bottle becomes larger, causing the bottle cap to be difficult to twist open. Don't say that girls can't unscrew the cap, even if the boys screw it up is very difficult, and those glass canned products, because the packaging is more compact, the release torque is very large, it is more difficult to unscrew it empty-handed.
Therefore, many girls are really difficult to unscrew when opening the bottle cap, and boys should be more considerate, and there is no other special meaning.