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Matter is a substance that has inertia and occupies physical space. According to modern physics, matter consists of various types of particles, each with mass and size.

The most familiar examples of material particles are the electron, the proton and the neutron. Combinations of these particles form atoms. There are more than 100 different kinds of atoms, each kind constituting a unique chemical element. A combination of atoms forms a molecule. Atoms and/or molecules can join together to form a compound.

Matter can exist in several states, also called phases. The three most common states are known as solid, liquid and gas. A single element or compound of matter might exist in more than one of the three states, depending on the temperature and pressure. Less familiar states of matter include plasma, foam and Bose-Einstein condensate. These states occur under special conditions.

Different kinds of matter can combine to form substances that may not resemble any of the original ingredients. For example, hydrogen (a gaseous element) and oxygen (another gaseous element) combine to form water (a liquid compound at room temperature). The process of such combination is called a chemical reaction. A chemical reaction involves interactions between the electrons of the atoms, but does not affect the nuclei of the atoms.

In some situations, matter is converted into energy by atomic reactions, also known as nuclear reactions. This type of reaction is fundamentally different from the chemical reaction because it involves changes in the nuclei of atoms. The most common example of an atomic reaction is the hydrogen fusion that occurs inside the sun. The immense pressure inside the sun, and inside other stars, forces atoms of hydrogen together to form atoms of helium. In this process, some of the mass is converted to energy according to the formula

E = mc 2

where E is the energy in joules, m is the mass in kilograms, and c is the speed of light, which is approximately 2.99792 x 10 8 meters per second in a vacuum.

In recent years, scientists have confirmed the existence of a substance called antimatter. The electron has an antiparticle twin called a positron, with equal mass but opposite electric charge. Similarly, the proton has an antimatter twin called an antiproton, and the neutron has an antimatter twin called an antineutron. If a particle of matter encounters its antiparticle, both are converted entirely to energy according to the above formula, where m is the combined mass of the particle and the antiparticle. Small amounts of antimatter have been isolated in laboratory conditions, but no one has yet succeeded in creating a controlled a matter/antimatter reaction, or even an uncontrolled reaction of significant size.

This was last updated in May 2016

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what is matter defination

I disagree with your definition of Matter.  65 years ago I was taught in school the 3 types of Matter were Gas, liquid, and solid.  Since then Plasma has been added.  It was wrong then and is still wrong today.  There are 4 types of Matter, but, they are not Gas, Liquid, and Solid.  I would think that with all the great minds we have this would have been corrected.  When you want to describe types of Matter, you have to look at the condition of the Atom.  Type 1 Matter: Matter consists of Atoms that are made up of a nucleus which is comprised of Protons and neutrons and have 1 or more electrons in orbit around it.  Type 2 Matter: Consists of Atoms that have had sufficient energy applied that the electrons can no longer orbit the nucleus and break free jumping from Atom to Atom releasing a Photon with each jump. Plasma.  Type 3 Matter:  Matter which has had sufficient pressure applied that the electron is forced into the nucleus where it remains. Since this material has no molecular motion it would be at absolute zero, it will not produce heat or light.  It would also be at absolute black.  Any light that strikes the surface would be absorbed.  I suspect this is the material Black Holes are made of.  Type 4 Matter:  This matter consists of crushed atoms.  I suspect this is the type matter of a Nodule, the structure our Universe sprang from.  Paul F Lindsey   
this really helped me with my presentation(:


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