CoachFiltering is pouring a mix through a filter: a sheet of paper, a cloth or a layer of sand with holes too small to let the solid pieces through. The solid stays on the filter; the clear liquid that passes through is called the filtrate.
Examples
Example 3.10 (Sand, salt and water)
A jar holds water with sand and salt in it. The salt has dissolved; the sand has not.
- Filter: the sand stays on the paper.
- The filtrate is clear, but it is salty water. Evaporate it: the salt stays in the dish.
Two methods, one after the other, give back the sand and the salt.