Population tables. of world cities. This article lists the most populous cities in the world defined according to a concept of city proper. A city proper is a locality defined according to legal or political boundaries and an administratively recognised urban status that is usually characterised by some form of local government. Cities proper and their boundaries and population data may not include suburbs. World Urbanization Prospects, a UN publication, defines population of a city proper as the population living within the admi
The mass of one cubic centimeter of copper is 8.96 grams, while the mass of the same amount of zinc is 7.13 grams. 1  A penny is made of copper and zinc. 2  Copper is heavier than zinc. 3  The cost of copper has been on the rise during the past couple of decades.
Why Not Pennies? You may ask, why not accumulate 95% copper (pre-1982 mint date) pennies? They already seen a spike in their base metal value to 2.2 cents each. But unfortunately, pennies have two problems: confusion and bulk. They are confusing, because 95% copper pennies are now circulating side-by-side with 97.5% zinc pennies. They are also about four times as bulky (per dollar of face value) as nickels. With nickels you wonât have to spend time sorting out pre-1982 varieties. At present, visually date sorting pennies simply isnât worth your time.