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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