Perrin’s hypothesis reborn
In a unimolecular reaction a molecule breaks into two smaller molecules (or atoms) in a manner that appears to be independent of the chemical composition of its surrounding. The number of molecules fa...
Modelling electron orbits
In 1911 Niels Bohr used quantum theory to explain how negatively charged electrons could remain in certain orbits without radiating energy. Patent 5695344 describes an educational demonstrator that si...
