The Elements of Natural Philosophy (Classic Reprint)

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Excerpt from The Elements of Natural Philosophy On the other hand, if the iron be exposed to moist air it crumbles to a red powder, if it be placed in weak sulphuric acid, it is converted into a green, crystalline solid. If steam be passed over red hot iron, it yields a combustible gas (hydrogen). If sealing-wax is burned, it passes away into colorless gases which can never again be united to form wax. Such changes are called chemical changes, and the agencies by which they are caused are called chemical forces. The principal chemical force is affinity. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.