新理念大学英语阅读教程unit12 entropy

新理念大学英语阅读 教程 人力资源管理pdf成真迷上我教程下载西门子数控教程protel99se入门教程fi6130z安装使用教程 unit12 entropy Entropy It was about two months ago when I realized that entropy was getting the better of me. On the same day my car broke down (again), my refrigerator conked out and I learned that I needed root-canal work in my right rear tooth. The windows in the bedroom were still leaking every time it rained and my son’s baby sitter was still failing to show up every time I really needed her. My hair was turning gray and my typewriter was wearing out. The house needed paint and I needed glasses. My son’s sneakers were developing holes and I was developing a deep sense of futility. After all, what was the point of spending half of Saturday at the Laundromat if the clothes were dirty all over again the following Friday? Disorder, alas, is the natural order of things in the universe. There is even a precise measure of the amount of disorder, called entropy. Unlike almost every other physical property (motion, gravity, energy), entropy does not work both ways. It can only increase. Once it’s created it can never be destroyed. The road to disorder is a one-way street. (entropy的 特性) Because of its unnerving irreversibility, entropy has been called the arrow of time. We all understand this instinctively. Children’s rooms, left on their own, tend to get messy, not neat. Wood rots, metal rusts, people wrinkle and flowers wither. Even mountains wear down; even the nuclei of atoms decay. In the city we see entropy in the rundown subways and worn-out sidewalks and torn-down buildings, in the increasing disorder of our lives. We know, without asking, what is old. If we were suddenly to see the paint jump back on an old building, we would know that something was wrong. If we saw an egg unscramble itself and jump back into its shell, we would laugh in the same way we laugh at a movie run backward. (注意本段的一系列动词) (entropy是什么,为什么被称作时光之箭?) Entropy is no laughing matter, however, because with every increase in entropy energy is wasted and opportunity is lost. Water flowing down a mountainside can be made to do some useful work on its way. But once all the water is at the same level it can work no more. That is entropy. When my refrigerator was working, it kept all the cold air ordered in one part of the kitchen and warmer air in another. Once it broke down the warm and cold mixed into a lukewarm mess that allowed my butter to melt, my milk to rot and my frozen vegetables to decay. (注 意本段的一系列动词) (entropy是什么) Of course the energy is not really lost, but it has diffused and dissipated into a chaotic caldron of randomness that can do us no possible good. Entropy is chaos. It is loss of purpose. (entropy是什么) People are often upset by the entropy they seem to see in the haphazardness of their own lives. Buffeted about like so many molecules in my tepid kitchen, they feel that they have lost their sense of direction, that they are wasting youth and opportunity at every turn. It is easy to see entropy in marriages, when the partners are too preoccupied to patch small things up, almost guaranteeing that they will fall apart. There is much entropy in the state of our country, in the relationships between nations—lost opportunities to stop the avalanche of disorders that seems ready to swallow us all. Entropy is not inevitable everywhere, however. Crystals and snowflakes and galaxies are islands of incredibly ordered beauty in the midst of random events. If it was not for exceptions to entropy, the sky would be black and we would be able to see where the stars spend their days; it is only because air molecules in the atmosphere cluster in ordered groups that the sky is blue. The most profound exception to entropy is the creation of life. A seed soaks up some soil and some carbon and some sunshine and some water and arranges it into a rose. A seed in the womb takes some oxygen and pizza and milk and transforms it into a baby. The catch is that it takes a lot of energy to produce a baby. It also takes energy to make a tree. The road to disorder is all downhill but the road to creation takes work. Though combating entropy is possible, it also has its price. That’s why it seems so hard to get ourselves together, so easy to let ourselves fall apart. Worse, creating order in one corner of the universe always creates more disorder somewhere else. We create ordered energy from oil and coal at the price of the entropy of smog. I recently took up playing the flute again after an absence of several months. As the uneven vibrations screeched through the house, my son covered his ears and said, “Mom, what’s wrong with your flute?” Nothing was wrong with my flute, of course. It was my ability to play it that had atrophied, or entropied, as the case may be. The only way to stop that process was to practice every day, and sure enough my tone improved, though only at the price of constant work. Like anything else, abilities deteriorate when we stop applying our energies to them. That’s why entropy is depressing. It seems as if just breaking even is an uphill fight. There’s a good reason that this should be so. The mechanics of entropy are a matter of chance. Take any ice-cold air molecule milling around my kitchen. The chances that it will wander in the direction of my refrigerator at any point are exactly 50-50. The chances that it will wander away from my refrigerator are also 50-50. But take billions of warm and cold molecules mixed together, and the chances that all the cold ones will wander toward the refrigerator and all the warm ones will wander away from it are virtually nil. Entropy wins not because order is impossible but because there are always so many more paths toward disorder than toward order. There are so many more different ways to do a sloppy job than a good one, so many more ways to make a mess than to clean it up. The obstacles and accidents in our lives almost guarantee that constant collisions will bounce us on to random paths, get us off the track. Disorder is the path of least resistance, the easy but not the inevitable road. Like so many others, I am distressed by the entropy I see around me today. I am afraid of the randomness of international events, of the lack of common purpose in the world; I am terrified that it will lead into the ultimate entropy of nuclear war. I am upset that I could not in the city where I live send my child to a public school; that people are unemployed and inflation is out of control ; that tensions between sexes and races seem to be increasing again; that relationships everywhere seem to be falling apart. Social institutions—like atoms and stars—decay if energy is not added to keep them ordered. Friendships and families and economies all fall apart unless we constantly make an effort to keep them working and well oiled . And far too few people, it seems to me, are willing to contribute consistently to those efforts. Of course, the more complex things are, the harder it is. If there were only a dozen or so air molecules in my kitchen, it would be likely—if I waited a year or so—that at some point the six coldest ones would congregate inside the freezer. But the more factors in the equation—the more players in the game—the less likely it is that their paths will coincide in an orderly way. The more pieces in the puzzle, the harder it is to put back together once order is disturbed. “Irreversibility,” said a physicist, “is the price we pay for complexity.”