Excerpt from Definitions in Physics Many of the fundamental ideas can be expressed by definitions Of the first type and are useful in facilitating a general exposition Of physical phenomena. These qualitative definitions are impor tant and the student should understand the exact meaning of the terms; but in general they do not present great difficulties. The meaning Of many such terms is known to every one, and it seems hardly worth while to define them. They are given only where they appear necessary as connecting links. NO attempt has been made to define such words as matter, substance, body, pressure. 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.