Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, simple or seemingly pure substances found in nature can in fact be mixtures of chemical substances. For example, tap water may contain small amounts of dissolved sodium chloride and compounds containing iron,. | The Project Gutenberg EBook of Histoire des nombres et de la numeration mécanique by Jacomy-Régnier 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 www.gutenberg.net Title Histoire des nombres et de la numération mécanique Author Jacomy-Régnier Release Date January 30 2009 EBook 27936 Language French START OF THIS PROJECT GUTENBERG EBOOK HISTOIRE DES NOMBRES Produced by Laurent Vogel and the Online Distributed Proofreading Team at http www.pgdp.net This book was produced from scanned images of public domain material from the Google Print project.
