"Everything at home shakes for no reason", I was attracted by this topic and couldn't wait to look down. The story begins: in the homes of three residential buildings in a residential area in Shanghai, water and chandeliers keep shaking. This situation lasted for several months, leaving residents unable to eat well and sleep well. Everyone thought it was an earthquake. After the experts arrived, they made a careful investigation and denied the statement that the earthquake could not last so long, and it was so powerful that it was easy to destroy houses. So what happened later?
Experts carefully investigated around the community, trying to find the source of vibration, but found nothing. Occasionally, they found a gravel factory 800 meters away from the community, and the vibration generated by the gravel crusher was particularly strong. It can be 800 meters away, which is not enough to cause things in the homes of residents in the community to shake. Experts infer that only when there is * * * vibration phenomenon in physics can it have such great power. After determination, the results are surprisingly consistent. The vibration frequency of the stone crusher is exactly the same as that of the residential building, which is 1.5 Hz. Sure enough, when the stone crusher was turned off, everything in the residents' homes stopped shaking. Finally unveiled this mysterious veil.
There is science in life and science is in life. As long as we explore and study, any mystery will be solved.
There is science everywhere in life. Today I will tell you two science stories.
On weekends, my mother cooks in the kitchen. Suddenly, the oil in the pot burned. I saw it and shouted, "mom, water it!" " Mother didn't go to get water, but quickly picked up the lid and closed it. After a while, the fire went out. I was surprised to ask my mother, "Firemen's uncles always put out fires with big waterwheels. Why not use water? " Mother smiled and said, "Fire fighting doesn't always use water, especially when the oil is burning. Because oil is lighter than water, pouring oil into the pot will explode, which will not only fail to put out the fire, but also easily cause a bigger fire. " My mother also told me that the fire needed oxygen, so I quickly put the cover on after the oil pan caught fire. After a while, the oxygen in the pot was gone and the fire was extinguished. I heard it suddenly.
"a door that will deform"
The door of my room is a solid wooden door, which is beautiful and will "deform". There are always a few days in summer when it is disobedient, and it is very laborious to close the door, as if it has gained weight; It seems to be thinner in winter, and there is always a small crack when closing the door. I asked my father what was going on, and my father explained, "It may be that the wood was not completely dry when the uncle worker made the door. In summer, when the weather is hot and the temperature is high, the wooden retractable door will become fat and won't close. In winter, when the weather is cold and the temperature is low, the wood will shrink, the door will become thinner and it will not close well. This is why it expands with heat and contracts with cold. "
After listening to my father's words, I feel that there is science everywhere in my life. I must study science well!
2
My family grows a lot of flowers. These flowers are planted in flowerpots with small holes. Why are there one or several holes under the plate for planting flowers?
When I watered the flowers, I found that if I watered them too much, they would flow out of the small holes under those flowerpots. If there are no holes and too much water is poured, the extra water will accumulate in the flowerpot, and over time, the roots will rot because of insufficient ventilation. But if you water it too little, the roots won't absorb enough water. There is a small hole under the flowerpot, so you can water the flowers safely, and the excess water will naturally flow away from the small hole.
The small holes under the flowerpot can not only let out excess water, but also let the roots of plants absorb more fresh air.
So that the flowers can stay in the flower tray more comfortably. I won't shout "I'm suffocating, I'm suffocating, come and help me!" " "It won't let those leaves and flowers with a hundred times the spirit hang their proud heads like shy little girls.
These small holes have another advantage. You can make the roots that can't be squeezed in the plate grow out of the hole, so that the roots won't be too crowded.
The holes under these flowerpots are so useful! It turns out that planting flowers should be scientific.
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