20 сентября, 2007
Physics is the science of matter and its motion, as well as space and time - the science that deals with concepts such as force, energy, mass, and charge. Physics is an experimental science, and it is the objective of physicists to understand some quality of the natural world.
Physics is one of the oldest academic disciplines and through its modern subfield of astronomy, it may be the oldest of all. Although these sciences are seen as distinct today, philosophy, chemistry, mathematics and biology are all "branches" of physics. During the last two millennia these sciences became more distinct and physics emerged as a modern science in the 17th century. Even though these disciplines are now generally distinct the boundaries between them remain fluid and sometimes difficult to distinguish.
Today, physics is a broad and highly developed subject. Research is often divided into four subfields: condensed matter physics; atomic, molecular, and optical physics; high-energy physics; and astronomy and astrophysics. Most physicists also specialize in either theoretical or experimental research, the former dealing with the development of new theories, and the latter dealing with the experimental testing of theories and the discovery of new phenomena. Despite important discoveries during the last four centuries, there are a number of open questions in physics, and many areas of active research.