By Kate

A tiny piece of anything. Usually we can't see and touch it.

Another word "staff." It's made of different types of particles.

It's meaning how many things (people, animals) in certain area. 

The process when particles become from liquid to solid.

The process when particles become from solid to liquid.

The process when particles become from gas to liquid. 

The process is opposite to condensation. Particles become from liquid to gas.

A substance made of mixing other substance together.

Solution is a mixture of two or more substances, that can change. 

Very strong mixture, even doesn't mixing.

Substance that is dissolved in a solution. 

Liquid substance, in which materials dissolve to solution.

When the solution can't dissolve more. 

Dilution is the process when add more solvent to the solution, such as water.