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Saturday 27th August 2016
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Why do 10p coins have different thicknesses?


Why do 10p pieces have a different thickness? Aren’t all coins exactly the same?
Tom, Tottenham


** Definitive **
Name: Tony, Twickenham
Qualification: Coin collector for 30 years
Answer: It’s not so much the thickness. It’s the density of them and it’s down to cost-cutting. Until recently our “silver coins” were made of cupronickel, which is an alloy made of copper and nickel. As the price of copper increased, the copper element was removed, so now the coins are now made primarily of nickel. It’s an illusion that the thickness has changed, as otherwise they wouldn’t work in a vending machine.

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