It depends, sometimes they are called blanks, other times they are called planchets, occasionally you will hear them called flans. All of them are correct though the term planchet or flan is used more with coin collectors while the term blank is used by pretty much everyone else.
No single piece of metal will produce electricity when heated. You will need two different metals, mechanically touching. When the join between the metals is heated, it will produce electricity, dependant on the metals used. This is known as a 'thermocouple'.
When you "burn" something you simply combine it with oxygen, you oxidise it. Rapid buring of a metal can be achieved in the presence of heat and Oxygen to produce an oxide of the metal.
An ingot is a block of solid metal.
Metal plating.
salt
Stamped steel.
Whatever marking you find on a ring marks the mounting, not the stone. The indicator 14d stamped in the metal may indicate a style, type or design.
Transmission pans can be cast metal, stamped metal, or plastic.
As the Common Metal Marks Stamped Inside Rings, TI=Titanium
375 stamped into a white metal ring indicates the number of carots in the jewelry. 9 carots White Gold. It is CARATS not carots
Cheap ones stamped metal evpensive ones cast metal
Diamonds are not stamped: perhaps the metal setting is stamped. Take your jewelery to a local jewelery shop and ask that the diamond be tested.
375 stamped on any type of precious metal jewelry is generally an indicator of the percentage of precious metal. In your case, your silver is likely 37.5% silver.
The 625 which is stamped on a white metal ring means the ring is classified as 15 carats. Jewelers place the marks on jewelry so they can be easily identified.
The metal is soft & they are stamped with an engraved die.
coin?
Is it real gold