What are Iron Filings and How are they Used in Physics?

• 'Filings' simply means tiny shavings or dust.
• Definition: Iron filings are massively tiny, microscopic pieces of pure metallic iron.
• How are they made?: They are usually the massive waste product from heavy metalworking factories. When a carpenter uses a massive metal file to aggressively scrape and smooth a block of iron, the tiny iron dust that falls to the floor is collected and sold as iron filings.

Because iron is a highly 'ferromagnetic' metal, it violently reacts to magnets. Here is the famous experiment:

1. Place a massive, strong Bar Magnet completely flat on a wooden table.
2. Place a piece of stiff, pure white paper directly over the magnet to hide it.
3. Take a salt-shaker filled with iron filings and heavily sprinkle the iron dust all over the white paper.
4. Gently tap the paper with your finger.

• The instantly magical result is that the random iron dust physically forces itself to rearrange.
• Because every single speck of iron dust temporarily becomes a tiny, massive compass needle, they all violently snap into a highly distinct, symmetrical pattern.
• You will physically see beautiful, massive curved lines connecting the North Pole of the magnet to the South Pole. These lines officially prove the existence and exact shape of the invisible Magnetic Field Lines surrounding the magnet.