1. Decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path of a detector, but not including the reduction due to geometric spreading, i.e., the inverse square of distance effect.
For the purists, there are about 145 copper cents / pennies in a pound. On the other hand, post 1982 zinc cents which have a copper plating over a much softer, much lighter zinc planchet. So there are about 180 zinc cents / pennies per pound. Those numbers of pennies per pound are of course for new, uncirculated, zinc or copper cents. When minted, new copper cents weigh about 3.11 grams each and new zinc cents about 2.5 grams each and that is our basis for the number of pennies in a pound. However, once they are put in circulation, they start to ware thinner and thinner.
This forces the very edges of the penny to push up which is what gives the penny the lip that it has. The size of the penny is very important. The weight of it is 2.500 grams exactly. The diameter is 0.750 inches or 19.05 mm. Finally, the thickness is 1.55 mm. The good thing about coins is that their sizes are always the same for the most part.