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h1. Mass

\\ {excerpt}A quantitative measure of the resistance of an object to attempts to change its [velocity].   Hence mass is a measure of inertia (from the Latin _vis inertia_, the force of inaction.) 
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Newton equated mass and "_quantity of matter_", which he said arises "_from its density and bulk conjointly_."

_Gravitational Mass_, which appears in the Law of [gravitation (universal)], has been shown to be proportional to _Inertial Mass_ to better than one part per trillion.  \[See the [Eotvos experiment,  page in Wikipedia|http://en.wikipedia.org/wiki/E%C3%B6tv%C3%B6s_experiment], much more accurately performed at the University of Washington  - _Physical Review Letters 100, 041101 (2008)_.\]  This equality is assumed by the _Principle of Equivalence_ and is a cornerstone of Einstein's theory of _General Relativity_.  This theory indicates that all forms of energy have mass via the relationship E=mc2. 

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