How to use a magnetizer/demagnetizer

How does a magnetizer/demagnetizer work?

Insidee Out on Instagram: "Repeated hammer strikes on metal can actually generate enough heat through friction and deformation to ignite flammable materials. This happens due to the transformation of kinetic energy into thermal energy at the point of impact. When a hammer hits a piece of metal at high speed and with consistent force, the metal's internal structure resists the change, releasing heat. If the contact is intense and frequent enough, temperatures can spike quickly - even reaching ign