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Matter is anything that has mass and occupies space. It is found in three different states: solid, liquid and gaseous. Matter, as Albert Einstein explained in his Theory of Relativity, can also be described as a condensed form of energy. In Einstein’s own words:”Mass and energy are two different aspects of the same thing”.
We can see this in nuclear fission. The energy condenses to form a nucleus. When we bombard the nucleus with a neutron, the nucleus separates and releases some of the energy in the form of heat.
Nuclear Fission
Theory of Relativity
A Nucleus
Matter and Energy