The last issue of Xiao Bian has already introduced to everyone the usual misconceptions about automobile fuel consumption. After we read it, we have not corrected our views. We must know that some misunderstandings will affect our judgment of the entire vehicle situation. Next, Xiao Bian will introduce you to some of the misunderstandings about car safety. We must not neglect safety issues. Thicker wagons will be safer The thickness of the wagon will affect the damage caused by minor collisions, which will affect the maintenance cost, as well as the soundproofness and sense of quality of the vehicle. However, it is really not important to protect the safety of passengers. What is important for passengers is the strength of the steel frame and the ability to keep the body intact after the collision. The heavier and safer the car In other circumstances, the increase in vehicle weight will result in a decrease in control limits and braking performance, and it will be even less secure. To give a simple example, can a car increase safety by placing more bricks in the car? Two cars at the same level are light and heavy. This may be because the latter’s lightweight design level is not enough, or the strength of the steel frame is not good enough to do with more sturdyness, and it is often impossible to say that the latter has the best safety. In fact, Golf 7, which is currently one of the most prominent A-class vehicles, is just the lightest. For two cars with the same crash performance, the heavy cars are generally safer. In the crash test, because it is a collision against a wall, the impact force is proportional to the weight. Therefore, with the same safety cage deformation, the heavy vehicle is subjected to greater impact. In most colliding accidents, heavy vehicles and light vehicles have the same impact. At this time, heavy vehicles have advantages. In addition, the acceleration of the heavy vehicle after impact is also smaller, and the possibility of injury to the occupant is also reduced. SUV is safer than cars SUVs driving in the urban areas, and high-speed general rear-end, is indeed a high position will occupy the cheap. Far-sightedness is also an advantage. However, the big disadvantage of SUVs in high-speed driving is that because of the high center of gravity, it is easier to turn the corners, and the lethal rate of rollovers is the highest, especially for rainy and snowy weather. The same price SUV platform is often one level lower than the same price car, and sometimes reflects the design of safety. In fact, the safety of the same price SUV and car is actually similar. Many people think that SUVs are safer because SUVs look thick and thick, but in fact, these two points have no effect. The smaller the vehicle deformation after collision, the better the safety of the vehicle In fact, good safety, it should be the front of the vehicle fully collapsed to absorb energy, but the cab remained intact. If they are complete, without a car to absorb energy, people will have to absorb more of the kinetic energy of the collision. In fact, it is even less safe. With anti-collision steel beams, manufacturers are indifferent to consumer safety The main role of the anti-collision steel beam is to reduce the damage of the car body under low-speed collisions, which is significant for reducing the maintenance cost of small collisions, but it has no effect on the medium-high speed collisions that really threaten the passengers. Sedan is safer than hatchback Many people think that hatchback car rear protection is poor. This is actually no difference. In general, hatchbacks will be particularly strengthened at the rear of the car, so in many cases the body is shorter and heavier than a platform sedan, which can compensate for the disadvantages of a small buffer distance. The real problem is the third row of three-row MPVs and SUVs. Because various tests lack measurement on the third row, protection is very questionable. If you must buy three rows of seats, full-size design of the MPV, the third row of space is relatively large, after sitting three rows of rear distance is longer, may be better. Active safety is more important than passive safety Many people on the Internet say that active safety can avoid accidents, and it is even more useful than passive safety to reduce accident damage after an accident. So many people prefer ESP instead of side airbags or cars with better overall crash performance. This statement is not entirely correct. In urban driving, the most dangerous accident is often because you didn’t pay attention or the other person didn’t pay attention. At the intersection, a car crashes into another car vertically. In this case, you can't avoid it. Active safety cannot work at all. Side airbag curtains and good frame rigidity are useful. When driving at high speeds, there are dangers in most situations. The correct approach is to hit the brakes instead of slamming the steering wheel (even if there is ESP, it is easy to roll over). In this case, a good frame is rigid, and Air curtains and knee airbags are also more useful than ESP. China is a country with a very short time for car use. The misunderstandings of the people in the car are really not common. Fuel consumption and safety are two points that are most easily misunderstood by people. Therefore, Xiao Bian specifically lists it, and there are more mistakes. I am waiting for everyone to explore and discover together, so act quickly and let Xiaobian wait for you to propose!
Calcium carbide is an inorganic substance, the chemical formula is CaC2, the main component of calcium carbide, white crystals, industrial products are gray-black lumps, and the cross section is purple or gray. It reacts violently when encountering water, generating acetylene and releasing heat. Calcium carbide is an important basic chemical raw material, mainly used to produce acetylene gas. Also used in organic synthesis, oxyacetylene welding, etc.
Acetylene produced by the reaction of calcium carbide with water can synthesize many organic compounds such as synthetic rubber, synthetic resin, acetone, ketene, carbon black, etc.; at the same time, acetylene-oxygen flame is widely used in metal welding and cutting.
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