In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientist's predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected.Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said, "Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house."Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses.In a way, any hypothesis is a leap into the unknown. It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. Without hypothesis, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.
科學理論 Scientific Theories
- 相關文章
- Similar or different friends
- 創新
- The Definition of Price
- Andrew Carnegie
- Advertisement on TV
- 在學校住還是租房住
- 研究生 Rush for Postgraduate Study
- What I Have Lived For
- My Grandpa
- 大學生的禮貌問題
- 美洲黑熊 American black bears
- 話劇 The Beginning of Drama
- 英國和法國之間的戰爭the war between Britain and F
- 神六問題
- 信息安全問題
- 公共場所安全問題
- 英語四六級作文五大模板(3)
- 英語四六級作文五大模板(5)
- 英語六級圖表作文經典用詞
- On Open Policy