Everything is made of particles and that these
particles are always moving. In a solid the particles move the least, however, in a gas
the particles move the most.
In the right conditions, when solid particles meet liquid particles they can mix together to form a special mixture called
a solution. This process is called dissolving.
This process doesn't happen when any solid or liquid meet (your glass doesn't dissolve when you put water in it) only when the
right solid meets the right liquid. When they do dissolve, the solid part is called the solute and the liquid it dissolves in
is called the solvent.
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