Coconut gum can be opened, and Rouke is true!

Review expert: Miao Guangyao

Dr. Condenrate Physics

When I was surfing online yesterday, I saw a netizen smashing the coconut shell with gum! As a coconut juice enthusiast, Xiaobian also bought a lot of coconut, but every time, either let the store help to open his mouth, or he was unattractive.

It's hard to imagine how could such a hard coconut shell be "broken" by soft gum? After a closer look, the editor knew that it turned out that the coconut shells were smashed and can really be done.

Source 丨 Baidu Encyclopedia

Non -Newton

Before explaining the reasons "Coconut Shells", we must first understand a special material-non-Newtonian Fluid.

Non -Newtonian fluids, in the definition of physics, refer to fluids with non -linear relationships that are not satisfied with Newtonian viscosity experimental law, shear force, and shear. They will present the characteristics of solid or liquid under different conditions of stress conditions.

Source | Sina News

There are many categories of non -Newtonian fluids, which can be divided into pure sticky non -Newtonian fluids and sticky elastic non -Newtonian fluids. This type of fluid includes a variety of polymer polymer solutions, foam solutions, suspension, biomoto, paste, etc., such as egg whites, gum, blood, etc. in daily life.

In various small experiments, the non -Newtonian fluids commonly used are usually 2 categories in pure viscous non -Newtonian fluids, namely shearing thickened fluids and shearing and thinning. The gum with the coconut shells mentioned above is the shear thickened fluid. Let's talk about it in detail.

Cut thickening the fluid, eat soft and not hard

Shear Thickening refers to a new structure in the liquid when the shear rate or shear stress increases to a certain value, resulting in an increase in resistance, which leads to an increase in the apparent viscosity of the liquid. At the same time Blood swelling phenomenon.

Under normal circumstances, the thickened and thickened fluids show a soft state. When the external shear force, such as violent stimulation such as impact, the inter -molecular stress inside the fluid will become larger. It will become hard, which is commonly known as encountering strong, and strong.

Source | Baidu know

Source | Network

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The reason why chewing gum can smash the coconut shell is because the glue -based components contained in gum belong to this shear thickened fluid; if gently pressed the chewing gum, it will feel that its touch is very soft, but if it is quickly hit, it will be quickly hit, but it will be quickly hit, but if it is quickly hit, The gum will harden instantly, and the reaction force brought by the impact when smashing the coconut forcefully, it is not surprising to pierce the coconut shell in minutes.

Source | "Come on! Variety screenshot to the future

In daily life, we can also easily make a kind of shear thickened fluid, such as water starch formed after mixing with corn starch and water.

Stir with a spoon, you will find that with the increase of the stirring speed, the difficulty of stirring is also increasing; the surface of the water starch can not move quickly with a spoon; but put the spoon up, it will slowly sink ~

The actual application of shear thickening fluids is widely used. In the field of scientific research, liquid bulletproof jackets made by using this classic characteristics are more comfortable than ordinary fiber bullet -proof coats and better bulletproof effects.

Cut into a thin body, eat hard and not soft

Contrary to the thickened fluid of the shear, the shear Thinning is reduced (shear Thinning) to reduce the viscosity of the fluid with the increase of the shear. Essence

Source | Baidu know

Under normal circumstances, when the shear force is not affected, they show a viscous state. If they are applied enough, such as rapid stirring, the molecular chain in the fluid will be easier to slide with each other, and the fluid will change. dilute.

For example, the tomato sauce we commonly use is also a type of shearing into a sparse body. The bottom of the tomato sauce bottle often has a layer of tomato sauce, which can not flow out gently, but when we tap the bottom of the bottle or throw behind the bottle, the tomato sauce can flow out.

Source | SOOGIF.com

Swamp is also a kind of scrutiny and thinning body. When it is trapped quickly, if it is struggling quickly, it will cause the swamp to become thinner and then accelerate the degree of sinking. So we see that some survival guidelines will tell everyone that once you fall into a swamp, do not struggle but try to expand the speed of delaying the sinking of the limbs as much as possible. If you really encounter danger in the wild swamps, everyone must remember not to struggle hard.

Why did the chewing gum lose "divine power"

Back to the problem of "Coconut Shells with Coconut Shells", can if it is chewing gum, can I also open the coconut shell?

This problem starts with the ingredients of chewing gum. The main component of gum is sugar and ester glue matrix. In chewed gum, the sugar is absorbed by the human body, the sugar becomes less, and the moisture becomes more. As a result, the structure of the non -Newtonian fluid disappears.

Compared with the chewing gum, the chewing gum shear and thickening effect is poor, and naturally it loses the "divine power", and the effect of smashing coconut shells will be discounted.

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