This Victorian one penny model was a suggested design by Joseph ... to be in silver to compensate for the small intrinsic copper value but those produced in the greatest numbers had a copper ...

A copper penny is heated and suspended above the surface of acetone in a beaker. The copper demonstrates heterogenous catalysis in the combustion of acetone to carbon dioxide and water. This exotherm ...

This Victorian one penny model was a suggested design by Joseph ... to be in silver to compensate for the small intrinsic copper value but those produced in the greatest numbers had a copper ...