Physical science can be defined as the systematic study of the inorganic world. It is distinct from the study of the organic world and is in the province of biological science. Physical science is ordinarily considered to be made up of 4 broad areas – astronomy, physics, chemistry, and the Earth sciences. All of these are in turn divided into fields and subfields for detailed study.
Physics, in its modern sense, was formally founded in the mid-19th century as a means of synthesizing several older sciences like optics, acoustics, mechanics, electricity, magnetism, the physical properties of matter, and heat. This synthesis was created on the recognition that the different forces of nature are in fact interconvertible because they are different forms of energy.
The boundary between physics and chemistry can almost be considered arbitrary. The main demarcating factor between the two is that physics is concerned with the structure and behavior of individual atoms and their components and chemistry deals with the properties and reactions of the molecules formed with those atoms. These depend on energy, especially in the form of heat, as well as on atoms. Therefore, there is a strong connection between physics and chemistry. Chemists are usually more interested in the specific properties of elements and compounds, while physicists are concerned with general properties that are shared by all matter.
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