Mm is lenght, pound is weight. no translation available.
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The British One Pound coin is 3.15 mm thick, so a stack of 100 of them would be 315 mm high.
100 mm
304.8 mm
A pound coin is 22½ mm diameter, while a football pitch is approximately 100 x 40 metres, so 4000 square metres. Each coin fits in a 22½ mm square, which is an area of 0.0225 x 0.0225 square metres. That is .0005 square metres. The ratio of the areas is 4000 / .0005 so that football pitch would take 7.9 million pound coins.
304.8 mm in a foot