English penny of today: 3,56 g and 20,32 mm.
19 millimeters
about .4 grams
The mass of a 1984 cent is 2.5 grams.
0.20293g/cm3
of coarse grams
462.87gramms
A penny weighs more than a dime. Current US Penny: 2.500 grams Current US Dime: 2.268 grams
See my link post to specs from the US Mint. Diameter = 19.05 mm, Mass = 2.500 g
The mass of an English penny coin is 3.56 grams.
It's mass is 2.5 grams.
Current masses: US Penny: 2.500 grams US Nickel: 5.000 grams US Dime: 2.268 grams Before 1982, pennies had a mass of 3.11 gm. Before 1965, dimes were 2.5 gm.
A gram is a unit of mass. A millimetre is a unit of distance. The two units are therefore incompatible.