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.
The last copper coins minted by the Royal Mint were minted in 1860. Since then, copper coins have been made from bronze which, depending on the year, has a copper content of â¦ anything between 92% and 98% copper. More recently, in 1992, the Royal Mint changed from bronze 1 Penny and 2 Pence coins, to more cost effective copper plated steel coins.