how much do uk decimal coins weigh?

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I am using an alchemist's beam balance, but have very few metric weights, so wondered about our coinage and how much the individual coins weigh.
1p, 2p, (bronze) 5p, 10p, 20p, 50p, (nickel alloy), £1, £2, £5 ( not in circulation as at 1st November 2012).
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