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樂其行 發問於 科學及數學化學 · 1 十年前

Chemistry 10分

All coins(like 10c and $2 coins)are made of only one alloy but $10 coins are made of two .Why ?Give advantages of using two alloys in making coins.

1 個解答

  • 1 十年前

    In HK, the coins are composed of two kinds of alloys. Forthe yellow one, such as the 10c and 20c coins, it is made of brass which composed of copper and zinc. For the white one, such as the $1, $2 or $5 are composed of alloy with copper and nickel. Functionwise, there is no obvious advantage in making the coins with two alloys. However, with two different colors in one coin, it makes the coin much nicer and more precious. In addition, in making this kind of coin, it may require more technique in producing this kind of coin. So, this makes the people more difficult to make the fake coins. In fact, many countries such asThailand and Europe use the coins with two alloys for those with higher value.

    I hope this information can help.

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