General introduction to Physics

Physics is the most fundamental branch of science. It deals with the study of nature and natural phenomenon which are related with the study of properties of matter and energy and their interaction. The word physics is derived from a Greek word whose meaning is 'the nature'. So , it is the study of the laws of nature.

In other words, making formulae of the nature is the physics. The study of the physics of the nature starts from our daily experience. In our daily life, first we happen to observe an event of the nature. Once we observe the event, then we want to know mathematically how the nature works for the observed event. Then we try to search for a mathematical relation which best fits it. Once we find the mathematical model for the event we want to verify it experimentally. We perform experiments and obtain data from them. Then the data so obtained is fitted to the mathematical model. If it suits the model, the model becomes a law of physics.

The study of physics is very vast and scope very wide. In the study of micro objects we study about the electrons, protons, neutrons and even their constituents and stars, planets, galaxies and the universe in the study of macro objects. There is no boundary in the study of physics. It has some fruitful outcome in each study of physics which is used by the society. When the society uses the new outcome of physics it become more advanced than before. If we look around us, we are surrounding the outcomes of physics.

We use microscope as the main tool of biological science which is designed and made according to a simple law of light. There is close connection between practical development in engineering fields and physics. The engineers designed modern bridges, heavy building structure, containers, roads and various types of vehicles by applying law of physics. Principle of thermodynamics is used to design heat engines, refrigerator etc. The knowledge of electricity and magnetism is used to develop huge electrical generator, electronic devices such as radio, television and computers. The knowledge of absorption and emission of electromagnetic energy are used in medicine for the diagnosis of diseases . The study of sound is important to design auditorium, tape recorder, speakers, hearing aids. Similarly, study of ultrasounds leads to greater changes in medical applications. Nowadays, it is common for us to use ultrasound technique to determine the presence of stones on liver and kidneys. Study of light helps doctors to know about the power of lenses required for the patients to be given in order to correct the defect of vision. Research in physics makes possible not only for diagnosis but also treatment of diseases such as nuclear physics researches helps to the treatment of cancer tissues and other illness. It also helps to detect the illegal goods and minimizes criminal activities.

All these fascilities are the outcomes of physics. So we can consider physics as the most fundamental branch of physics.