decantation is reversible change
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Answer:
1. Immiscible Liquid Separation
Decantation can be used to separate two liquids that have different densities as long as they are immiscible. For example, water and oil form two separate layers when mixed together. Water being denser settles at the bottom and oil floats on water, forming two distinct layers. The separation can be done by pouring oil out into a different container, leaving behind the denser water in the original container. Generally, this type of separation is flawed, because it is difficult to pour out the top layer without pouring out some part of the bottom layer.
An alternate method of separating two immiscible liquid is via a separatory funnel. This apparatus has a valve with a stopcock to allow the effective separation of the two immiscible liquids.
