Bimetal

thumb|right|Thermocouple connected to a multimeter displaying room temperature in °C

Bimetal refers to an object that is composed of two separate metals joined together. Instead of being a mixture of two or more metals, like alloys, bimetallic objects consist of layers of different metals. Trimetal and tetrametal refer to objects composed of three and four separate metals respectively. A bimetal bar is usually made of brass and iron.

thumb|right|Galvanized surface with visible spangle thumb|Protective effect: completely rusted letter box mounted to a hot-dip galvanized wall Galvanization (also spelled galvanisation) is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are coated by submerging them in a bath of hot, molten zinc.

strip used to convert a temperature change into mechanical displacement

coin consisting of more than one metal or alloy

thumb|The ZMC-2 [[airship, the first aircraft to use Alclad in its construction]] Alclad is a corrosion-resistant aluminium sheet formed from high-purity aluminium surface layers metallurgically bonded (rolled onto) to high-strength aluminium alloy core material. It has a melting point of about . Alclad is a trademark of Alcoa but the term is also used generically.