The CPI takes a constant basket of goods and sees how the price changes from year to year. If the price of the basket of goods increases, then there is price inflation. If the price of the basket of goods decreases, then there is deflation.
Copper and tin mainly make up bronze but other elements include phosphorus, manganese, silicon and aluminium.
Main article: Brass. A brass is an alloy of copper with zinc. Brasses are usually yellow in color. The zinc content can vary between few % to about 40%; as long as it is kept under 15%, it does not markedly decrease corrosion resistance of copper. bronze is an alloy of copper and other metals, most often tin, but also aluminium and silicon. 1  Aluminium bronzes are alloys of copper and aluminium. 2  Bell metal. 3  Phosphor bronze. 4  Nickel bronzes, e.g. nickel silver and cupronickel. 5  Speculum metal. 6  UNS C69100.