tailieunhanh - Flatland, by Edwin A. Abbott

Chemical substances (also called pure substances) may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook.[2] According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.[3] The chemical substance index published by CAS also includes several alloys of uncertain composition.[4] Non-stoichiometric compounds are a special case (in inorganic chemistry) that violates the law of constant composition,. | The Project Gutenberg EBook of Flatland by Edwin A. Abbott This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at Title Flatland Author Edwin A. Abbott Posting Date May 15 2008 EBook 97 Release Date January 1994 Last updated January 19 2005 Language English START OF THIS PROJECT GUTENBERG EBOOK FLATLAND Flatland by Edwin A. .