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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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