Heat Treatment of a Metal Bobby Pin - Tempering
The tempering process, which involves heating a hardened bobby pin then cooling slowly, transforms the brittle metal into springy metal.
metals
Heat Treatment of a Metal Bobby Pin - Hardening - Model of the Atomic Level
An atomic-level simulation shows what happens to the metal bobby pin during the hardening process.
Heat Treatment of a Metal Bobby Pin - Hardening
An annealed bobby pin is heated, then cooled quickly; this process is called hardening. The hardened bobby pin is brittle.
Hardness of Solid Substances - Grinding Magnesium
Magnesium metal is not easily ground or crushed.
Hardness of Solid Substances - Grinding Iron
Iron metal is not easily ground or crushed.
Hardness of Solid Substances - Grinding Zinc
Zinc metal is not easily ground or crushed.
Hardness of Solid Substances - Grinding Tin
Tin is a relatively soft metal that can be flattened.
Hardness of Solid Substances - Grinding Lead
Lead is a relatively soft metal that can be flattened.
Ferrimagnetism - Part 1 of 2 - Hematite and Magnetite
Hematite and magnetite are formed from iron(II) and iron(III) solutions.
Ferrimagnetism - Part 2 of 2 - Testing for Magnetism
Hematite and magnetite samples are tested for magnetism.