Why is it called a blast furnace? It’s called a blast furnace because lots of hot air is blasted into the furnace.
A hair dryer dries the lady’s hair quickly (blasts hot air).
The blast furnace
Coke, carbon and iron ore (haematite) are dropped into the top of the furnace. High temperature causes a reaction, the resultant molten iron sinks to the bottom while the molten slag floats on the top.