Heat the metal red hot. To harden the metal, cool it quickly by dunking it into cold water. To get a soft metal, let it cool slowly.
Manufacturers heat treat metal for a variety of reason. One reason is to alter the physical appearance of the metal. Another reason is to harden the metal. They may even heat treat the metal in order to soften the metal to make it more malleable.
Ovens
No - It means to treat rubber with sulfur and heat, so as to harden it.
Get a metal rod, heat it really hot wrap it around a metal pipe a little bigger than your wrists. and dunk it in water to harden.
Cold chisels are a blacksmithing tool that is used without fire or heat sources, hence the name cold chisel. These tools look like other types of chisels and can even resemble wood working chisels. However, they are much heavier looking upon closer inspection and typically are black or dark in color. They are completely made of metal as well, and do not have handles like a woodworking chisel.
Heat can soften some forms of matter and heat can also harden other forms.
It means it has been heated up to kill germs and bacteria, or it means that a metal has been treated to change its properties.
Marble is a metamorphic rock so it was formed by heat and pressure. :)
Using heat but just the right amount or it will cause cracking.
Heat affects some glues. -Epoxies for instance, will harden much more with even mild application of heat from a hairdryer or heat gun.
i think it is metal
yes because when you heat a metal ring it will expand