Because aluminum isn't made of metal
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Steel contains iron, which is ferromagnetic and can be magnetized. Aluminum, on the other hand, is not ferromagnetic but paramagnetic, so it is not attracted to magnets. This difference in magnetic properties explains why steel sticks to magnets but aluminum does not.
Yes, paper clips are typically made of steel which is magnetic, so they can stick to magnets.
Your mechanical valve is made of surgical steel. Magnets are attracted to steel.
Iron and steel are ferromagnetic materials, meaning they can be magnetized. When a magnet is brought near iron or steel, the magnetic field of the magnet aligns the magnetic domains within the material, causing them to attract and stick to the magnet.
Magnets are attracted to refrigerator doors because the doors are typically made of ferromagnetic materials like steel. The magnetic field of the magnet interacts with the atomic structure of the metal, causing the magnet to stick to the refrigerator.
It can. It can be magnetized. Both surfaces can be polished, and they will "ring in". It just has a fairly low coefficient of friction, which is great for moving heavy loads on train tracks... with low energy costs. another input: It can, through the process of "welding"