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.
Pennies (1-cent coins) are made of copper and zinc. The zinc is actually on the inside, so we only see the copper color on the outside! A nickel (5-cent coin) is made out of copper and another metal that is called nickel.That should be pretty easy to remember! Dimes (10-cent coins), quarters (25-cent coins) and half dollars (50-cent coins) are made of three really thin sheets of metal that get pressed together.The outside layers of metal are copper and nickel.The middle sheet is just copper ! You can see it when you look at the edge of the coins.imes (10-cent coins), quarters (25-cent coins) and half dollars (50-cent coins) are made of three really thin sheets of metal that get pressed together. The outside layers of metal are copper and nickel. The middle sheet is just copper ! You can see it when you look at the edge of the coins.