A tube filled with iron filings is magnetized and the magnetization is shown using a compass. Note: this demonstration can be shown on the overhead projector and is appropriate for large lecture halls ...

Phosphorus is a pollutant. It comes from stormwater runoff, sediment erosion, grass clippings, lawn fertilizer, and pet waste. It leads to depleting oxygen in pond water, one of the reasons stormwater ...

The magnetic field lines of a bar magnet can be viewed by using compasses or by shaking iron filings onto a platform above the magnet. Place the magnet on top of the paper in view of the document ...