Book · Relativity
Page 95 of 212
Author: Albert Einstein
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It is true that this important law had hitherto been recorded in
mechanics, but it had not been interpreted. A satisfactory
interpretation can be obtained only if we recognise the following
fact: The same quality of a body manifests itself according to
circumstances as "inertia" or as "weight" (lit. "heaviness"). In
the following section we shall show to what extent this is
actually the case, and how this question is connected with the
general postulate of relativity.
XX.
THE EQUALITY OF INERTIAL AND GRAVITATIONAL MASS AS AN ARGUMENT
FOR THE GENERAL POSTULATE OF RELATIVITY
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