What is Multi-Stage Flash Distillation?

Multi-stage flash distillation is one of the most popular methods of evaporating seawater to obtain freshwater, both on land and at sea in all types of ships. The article includes drawings, and a distillation chemical process diagram chart to illustrate this. Hot countries such as those in the Middle and Far East and drought-ridden parts of Australia and the USA are using reverse osmosis and multi-stage flash distillation as a means of desalination of seawater, with multi-stage flash distillation being most popular. This is mainly because of simplicity and running costs; reverse osmosis requires energy intensive pre-treatment of the seawater and expensive membranes.