Now no longer available from Dell as a new system purchase, but is in factory outlet. This desktop at one time filled the gap between the media-oriented XPS 420/430 and the high-end XPS 730x. There is no physical difference(s) between the 630 and the 630i.
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Definition of Inertia in Physics. Science. Inertia is the name for the tendency of an object in motion to remain in motion, or an object at rest to remain at rest unless acted upon by a force. This concept was quantified in Newton's First Law of Motion.