The science around us, the science around us?

One night, I was cooking dinner for my mother, and my mother asked me to unscrew the newly bought soy sauce bottle, but I couldn't unscrew it. I asked my mother, "Mom, why can't you unscrew the soy sauce bottle?"

Can you unscrew it for me? Mom said, "You go and use your brain, I won't help you twist it."

I was angry and said, "Mom, why don't you unscrew it for me?" Mom said

If you use your brain again, you just won't tell you. "I just have to think about it. I thought about it, I think it should be in the category of science.

So, I was unhappy and began to flip through the science books I had studied. Suddenly, I turned to the lesson of heat expansion and cold contraction, and my heart was sweeter than eating honey, and I was happier than getting 100 points in the test. I said to myself:

I'll try this thermal expansion and cold contraction! Usually, it is useless to watch your thermal expansion and contraction, and today I will try your ability to expand and contract. With that, he went to the kitchen and tried it.

Stir up some hot water first, soak the soy sauce bottle in hot water for five minutes, and then rinse it with cold water again, and it is easy to unscrew. I thought: Is there so much scientific knowledge hidden in human life?

Is this scientific knowledge just waiting for us to dig into? After this incident, I am grateful from the bottom of my heart that science has helped me improve and grow. I love you, science.

The iron frame support on the pole is triangular. Because the triangle is the most stable form. Satisfied, begging, begging. Thank you.

Please be clear.

1. What are matches made of.

There are two kinds of match rods: paper and wood, and wooden match rods are generally made of five or six kinds of firewood such as poplar and walnut. In the round head of the match, it contains potassium chlorate, potassium dichromate, iron oxide, sulfur, rosin, manganese dioxide, antimony sulfide, etc., and sometimes some lead monoxide is also appropriately incorporated. In order to facilitate the burning of matches, the rod next to the round end of the match is also coated with 1 cm long paraffin.

On a paper matchstick, this part is seen more clearly. The friction surface of the matchbox is coated with red phosphorus, antimony oxide, and sometimes manganese dioxide, silica sand, etc., which are the ignition agents. On the friction surface of the matchbox, press the match and slash it, and the red phosphorus on the friction surface burns first.

This heat causes the other oxidants to emit oxygen in an instant, and the paraffin on the rod is ignited, and the matchstick burns smoothly.

2. Why does it emit when it is windy?"Whoosh"sounds.

Strong winds are emitted when they hit something as slender as a power line or a tree branch"Whoosh"sounds. The slender whip violently shakes in the air, and behind the whip is a whirlpool of air, causing the air to vibrate and make a sound. The wind blows a tree branch in the same way that a whip is wielded.

In places with acute angles or behind crevices, this vortex is also formed when the wind blows, and it is emitted"Whoosh"The sound of the sound, and depending on the strength of the wind, the pitch is also different.

Bread should be eaten before drinking milk.

Milk is one of the most nutritious, appropriately proportioned, and easily digested and absorbed natural foods. However, drinking milk is very particular, and if the method is not appropriate, the effect will be greatly reduced. Experts believe that it is best to drink milk.

No added sugar. Otherwise, it is not only not easy to be digested and absorbed, but also remains in the digestive tract and affects gastrointestinal function. Milk can be heated, but not boiled. Because.

After boiling, some vitamins will be destroyed, and the calcium in milk will form calcium phosphate precipitation, which is not easy to be absorbed by the human body. Drinking milk on an empty stomach can accelerate gastrointestinal motility and cause malabsorption. The right way to do this is:

Eating bread, pastries, etc. for breakfast, followed by milk, will make the nutrition more balanced. At the same time, drink milk and do not eat chocolate at the same time. Because the oxalic acid in chocolate will combine with the calcium in milk to form calcium oxalate, so that calcium cannot be fully absorbed by the body.

Why does milk have a layer of skin when heated.

The skin that floats on the surface of the milk is coagulated protein. Milk contains all the essential nutrients for the growth and development of cattle, and protein is one of the most important nutrients. Proteins solidify once they are heated.

The reason why hard-boiled eggs will coagulate is because the protein in the egg coagulated. The proteins in milk also coagulate due to heating. Proteins, especially those of milk, can coagulate as soon as they go bad, even if they are not heated.

When proteins go bad, acids are produced, which can make milk coagulate. Yogurt coagulated with lactic acid bacteria can be eaten, but it is better not to eat milk that has spoiled naturally and has coagulated, because it is not known what kind of bacteria can cause illness in it.

What do you want to do, elementary school boy, haha.