Iron powder is must have equipment for any science classroom and budding scientists. A great way to show magnetic field lines is to sprinkle the powder onto a sheet of paper and place a magnet underneath the paper and see the powder align itself with the lines of magnetism produced by the magnet. PLEASE NOTE All imperial measurements [Inches () and Pounds (lb.)] are rounded conversions from metric [Millimeters (mm) and Kilograms (kg)] production measurements and should be used as approximations only.