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There are exactly 20 nickels in a dollar. Each individual nickel is worth 5 cents, and there are 100 cents in a dollar. Since 20 multiplied by 5 is equal to 100, there are 20 nickels per dollar.


A pound of nickels is the equivalent of 90.7 nickels. Each nickel weighs 0.176 ounce. Since 16 ounces equals 1 pound, 16 must be divided by 0.176 to discover how many nickels are in a pound.


According to The Phrase Finder, a plugged coin is one that has had part of it removed and then filled with a lower quality metal. Because nickels are already not worth much, a plugged nickel is completely worthless.


Nickel has to be mined from ore. It is mined in 23 countries around the world and refined in 25 countries. Some of the countries where nickel is easiest to obtain are Canada, Russia, Cuba, China, Australia and Greece. Major countries that refine or smelt nickel include France, Japan, Norway, Finland


Today, the United States nickel coin is made of a 100 percent copper center, with a surface made of 25% nickel and 75% copper. But this wasn't always the case. In the past, the nickel was called a half disme and was made from silver. Disme is pronounced the same way as the word dime.


Black nickel plating involves the process of coating brass, bronze or steel objects with a thin layer of nickel by means of electrolysis. Black nickel plating produces a thin jet black finish.


Nickel is a ferromagnetic element. Nickel, iron, cobalt and gadolinium are the only elements that are magnetic around room temperature. A ferromagnetic metal can be attracted to magnets and can be magnetized itself.


According to About.com, a standard roll of nickels contains 40 coins and is valued at $2. A standard roll of U.S. coins, also known as a shotgun roll, refers to one that has been wrapped with tamper-proof ends by a bank or a minting authority.


As of 2014, a nickel weighs 5 grams according to the specifications set by the U.S. Mint. A nickel's metal composition is classified as cupronickel. It consists of 25 percent nickel and 75 percent copper.


Nickel is a solid metal element at room temperature and has a density of 8.912 grams per cubic centimeter. It is also a hard metal and has good corrosion resistance, which is why it is alloyed with other metals to improve toughness and increase their ability to resist corrosion.