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.
True bronze is a combination of approximately 90% copper (Cu) and 10% tin (Sn), however there are three major classes or types of bronzes used in sculpture and construction. They are: 1. Statuary Bronze-approximately 97% copper (Cu), 2% tin(Sn) and 1% zinc (Zn); this composition is the closest to true bronze.2. Architectural Bronze-actually more of a leaded brass, is commonly composed of approximately 57% copper (Cu), 40% zinc (Zn) and 3% lead (Pb). 3.Commercial Bronze-composed of approximately 90% copper (Cu) and 10% zinc (Zn).. Architectural Bronze-actually more of a leaded brass, is commonly composed of approximately 57% copper (Cu), 40% zinc (Zn) and 3% lead (Pb). 3. Commercial Bronze-composed of approximately 90% copper (Cu) and 10% zinc (Zn).