- published: 17 Mar 2015
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Matter is anything that occupies space and has rest mass (or invariant mass). It is a general term for the substance of which all physical objects consist. Typically, matter includes atoms and other particles which have mass. Mass is said by some to be the amount of matter in an object and volume is the amount of space occupied by an object, but this definition confuses mass and matter, which are not the same. Different fields use the term in different and sometimes incompatible ways; there is no single agreed scientific meaning of the word "matter," even though the term "mass" is better-defined.
Contrary to the previous view that equates mass and matter, a major difficulty in defining matter consists in deciding what forms of energy (all of which have mass) are not matter. In general, massless particles such as photons and gluons are not considered forms of matter, even though when these particles are trapped in systems at rest, they contribute energy and mass to them. For example, almost 99% of the mass of ordinary atomic matter consists of mass associated with the energy contributed by the gluons and the kinetic energy of the quarks which make up nucleons. In this view, most of the mass of ordinary "matter" consists of mass which is not contributed by matter particles.
Ray Anthony Lewis (born May 15, 1975) is an American football linebacker for the Baltimore Ravens of the National Football League (NFL). Drafted by the Ravens in 1996, he has played his entire career for the team, and is the last player remaining from the Ravens' inaugural season. He has been selected to thirteen Pro Bowls and been named an Associated Press All-Pro ten times. He won the NFL Defensive Player of the Year in 2000 and 2003; he was the sixth player to win the award multiple times. He was also the second linebacker to win the Super Bowl Most Valuable Player Award and the first linebacker to win the award on the winning Super Bowl team. Widely considered to be one of the best linebackers of all time, he played college football at the University of Miami.
Lewis was born in Bartow, Florida. He is the older brother of former University of Maryland running back Keon Lattimore. Lewis was an All-American linebacker and wrestling star at Kathleen High School in Lakeland.
As a freshman at the University of Miami, Ray Lewis was an immediate contributor and became a starter for the Hurricanes' final five games. He compiled 81 tackles, two sacks, two tackles for loss, and four pass deflections en route to being named to the freshman All-American team.