Definition of 'optimum'. Word Frequency. optimum (ÉptÉªmÉm ) or optimal. adjective. The optimum or optimal level or state of something is the best level or state that it could achieve. [formal] Aim to do some physical activity three times a week for optimum health. ...regions in which optimal conditions for farming can be created.
Quick Answer. Pennies produced by the U.S. Mint since 1982 are an alloy of 2.5 percent copper and 97.5 percent zinc. The penny weighs 2.5 grams, so each penny contains 0.0625 grams of copper.
Only a few have been found, but more are believed to still be in circulation. How to spot it: The silver coin has a silver edge; the common copper/nickel coin has a strip of brown around the edge. Weight: A silver dime weighs 2.50 grams, while a copper/nickel dime weighs 2.27 grams.