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Matter 

 

Everything there is can be divided into one of three groups:

 

Solids   

A bar of gold is a solid. 
 

A solid has a definite shape and size, because its particles are tightly packed together. 

         

 

Liquids   

 

This drink is a liquid. 
 

A liquid has a definite size, but not a definite shape. The particles take on the shape of the container and are not so tightly packed.  

         

 

Gases   

 

This gas is given off from the liquid. 
 

A gas does not have a definite shape nor a definite size. The particles take up as much space as is available to them and are loosely packed.