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A Ream is a measure of the NUMBER of sheets of paper (500 sheets) How thick that would be will depend on the weight of the paper. Heavier paper is thicker.
The size of 4 A4 papers stuck together would be equivalent to the dimensions of a single A4 paper in terms of length and width, but the thickness would be four times that of a single sheet of A4 paper. A standard A4 paper measures 210 mm by 297 mm, so when four sheets are stuck together, the dimensions would still be 210 mm by 297 mm, but the thickness would be approximately 0.4 mm (assuming each sheet is 0.1 mm thick).
3000
A US penny is 1.55mm thick. Thus a stack of 1,000,000 pennies would be 1,550,000mm, or 1.55 kilometers (0.963 miles) high. A Canadian penny is 1.45mm thick. Thus a stack of 1,000,000 pennies would be 1,450,000mm, or 1.55 kilometers (0.901 miles) high. A post-1992 British penny is 1.65mm thick. Thus a stack of 1,000,000 pennies would be 1,650,000mm, or 1.65 kilometers (1.025 miles) high.
If it is sheets of paper in reams (500) = 1 pack