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The purpose of this encyclopedia is to present in two volumes a historical aspect for the important principles, laws, theories, hypotheses, and concepts that reflect this amazing progression of scientific descriptions and explanations of nature. This encyclopedia is designed for the high school and college-level student as well as for the general reader who has an interest in science. Physical laws are generalized factual principles that describe how things behave in nature under a variety of circumstances. Scientific principles are similar general statements about nature as are scientific laws. A scientific principle of nature must be objective and universal. Principles are not xxvi Introduction dependent on the views or statement of individuals but must be true from all points of view and true from all points of reference in the universe. Scientific theories are a type of model designed as general explanatory statements about the workings of nature. A hypothesis is a logical and rational explanation of a series of critical observations that have not yet been disproved or proved, nor accepted by the scientific community.

This  e-book contains 965 pages.