Any material capable of attracting iron-containing objects and creating a magnetic field outside itself is a magnet. By the end of the 19th century, it was discovered that all the known elements have some magnetic property.
Magnets have become a big part of our everyday lives. They’re used to make a close-fitting seal on freezers’ doors, power speakers in stereos, earphones, and televisions, store data in computers, and are an essential part of scanning machines MRIs. From our computers to our cars, magnets are everywhere! To understand their importance, here are some fun facts about magnets that you probably weren’t aware of…
1. Magnets were discovered around four millennia ago.
About 4,000 years ago, Magnes, a Greek shepherd, tending his sheep in a region called Magnesia, suddenly found that the nails that held his shoe together and the metal tip of his rod were attracted to a rock he was standing on.
Magnes discovered the first recorded lodestone. Lodestones were therefore called “magnetite,” probably named after Magnes or Magnesia.
2. They’re said to be much older.
Magnets are ancient. Well, today’s man-made magnets may not be so ancient, but the Chinese are said to have used the natural magnet lodestone as early as 800 A.D.
3. We’ve been using them for all kinds of things for centuries.
4. Kelvin defined magnet measurements.
In 1850, William Thomson (Lord Kelvin) defined the quantities which are used in characterizing magnetization.
5. You won’t see magnets working.
6. Here’s a trick to try…
If you put a bar magnet under a sheet of paper and scatter iron dust lightly over the top, you will suddenly see the invisible magnetic field as the particles stick to it.
7. Magnets attract lots of metals, but not all.
The metals magnets attract include iron, nickel, and cobalt. For magnetic objects to work, they must be in the magnetic field to respond.
8. It’s all about poles.
Magnets have 2 different poles, a north pole, and a south pole.
Magnets will repel and push away from each other if the same pole of one magnet is matched up to the same pole of another magnet. Magnets will pull together and attract each other if opposite poles are matched.
9. The planet is magnetic, too.
The Earth’s core has its magnetic field because it’s believed to be a mix of nickel and iron.
Compasses are using the Earth’s magnetic field to work and direct north, south, east, and west.
10. There’s a way to watch a magnetic field.
Iron filings can be used to show magnetic fields.
11. We need magnets for electricity in some cases.
Magnets are used for creating electricity. An electric current is created when a coil is wrapped around a magnet, also called an electromagnet.
Electromagnets are used in many diverse applications including generating electricity in hydroelectric dams. To create their power of magnetism electromagnets use electricity and they can be turned on and off.
12. All the fun of the fair!
The tracks of many roller coasters use electromagnets to send the carriages along.
13. They are highly useful to lift big scrap, too.
In junkyards, cranes use huge electromagnets to pick up scrap metal.
14. What are magnets measured in?
A tesla unit is the strength of a magnet.
15. There are some massive magnets out there.
The magnet situated at Los Alamos National Laboratory in New Mexico reaches 100 teslas, whereas the magnet located at Florida State University reaches a still-impressive 45 Tesla.
16. Big, yet… mighty?
Junkyard magnets used for lifting cars are only able to reach 2 teslas.
17. Don’t try this at home!
Heating a magnet or hammering it, will cause it to lose its properties.
18. Animal magnetism – it’s real!
Scientists believe that migrating birds are guided by the Earth’s magnetic field.
19. There’s magnetism at the core.
Planet Earth’s hot liquid core has iron which, as it moves, produces an electric current that generates a magnetic field around the planet.
20. Here’s a truly baffling fact…
The Earth’s magnetic field is 1,000 times weaker than a typical bar magnet.
21. Poles apart!
Earth’s magnetic poles are always moving, about 5 miles (40 km) each year.
22. Compasses need the poles.
The Earth has a magnetic north and magnetic south, which is what the needle on a compass point to. This is geographically different from the actual north and south poles because the invisible magnetic field lines run from the north to south poles.
23. MRI scanning is built around magnets.
Magnetic resonance imaging machines, MRIs use magnets, and they generate stronger fields than the Earth. MRIs field is about 60,000 times stronger than the Earth’s.
24. Not every planet has a magnetic field.
25. However, magnetic stars exist!
A star called a magnetar is the most powerful magnet in the universe, and they are strong enough to destroy small planets if they get close enough.
26. Magnets can transform from scratch.
Some metals can be turned into magnets by strong rare earth magnets.
27. Even iron can be magnetized!
Ferromagnetic materials like iron can be magnetized with a strong permanent magnet.
28. Make your own magnet!
Try rubbing a magnet on a screwdriver, the screwdriver will be able to pick up magnetic objects.
29. There’s magnetism in them hills…
There are magnetic hills, said to pull cars and other large magnetic objects to certain locations. Still, researchers have found out that these are not magnetic irregularities as much as a topographical illusion.
FAQs about Magnets
Are magnets harmful?
Potentially, yes - if you trap yourself between two magnets, you could cause yourself a serious injury!
Do magnets have healing properties?
Research suggests that no, magnets do not have any known healing properties.
Is it good to sleep on a magnet?
Weirdly - yes. It’s said that mattresses padded with magnets can help aid your sleep - the jury’s out!
Do you know any fun facts about magnets? Share them in the comments below!