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jueves, 19 de agosto de 2010

What Matter Is

:Mass: the amount of matter in an object.


Volume: the amount of space an object takes up.



Weight: (on Earth) a measure of the force of gravity between Earth and an object.  


Density: a measure of how tightly packed matter is; the a mount of mass contained in a given volume.


Buoyancy: the upward push on an object by the liquid (or gas) the object is placed in.


Conduct: allow heat or electricity to flow through readily.



Insulate: not allow heat or electricity to flow through readily.



Element: a basic building block of matter; a pure substance that cannot be broken down into anything simpler.


Compound: a chemical combination of two or more elements into a single substance.



Atom: the smalest unit of an element that still has the properties of the element.


Proton: a particle with a positive charge in the nucleus of an atom.


Neutron: an uncharged particle in the nucleus of an atom.


Electron: a particle with with a negative charge moving around the nucleus of an atom.


Nucleus: the dense center part of an atom.


Molecule: a group of more than one atom joined together that acts like a single particle.


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