The Separating funnel
In this technique, two liquids that do not dissolve very well in each other (immiscible liquids)
can be separated with the concept of unequal density. A mixture of oil and water, for
example, can be separated by this technique.
It works like this:
The two liquids in the mixture have different densities, making the heavier liquid settle at the
base of the container. In this setup, a funnel with a tap at the spout is placed inside a beaker.
The mixture is poured into the funnel and allowed to settle. Soon, the oil, which is heavier,
settles at the base, with the water on top of it. The tap is opened to allow the oil to pass,
and closed as soon as the water reached the spout.