Ferrofluids

We compare the properties of three iron mixtures: iron and water, iron and oil and a ferrofluid - a mixture of compounds containing iron and oil. First, we look at how iron filings behave when mixed with water and then oil. We then hold a magnet under a sample of ferrofluid to demonstrate that the liquid behaves as though it is a magnetic solution, when in fact it is a colloid.

Physics - Electricity And Circuits - Learning Points.
Iron is a magnetic metal.Mixtures usually retain the properties of their components.
Nanotechnology is a developing area of science.

A Twig Experiment Film.
Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.