The model of regular solutions, that may be applied to binary alloys (
e.g. Au-Pt, Si-Ge) has been compared to binary societies: blacks - non
-blacks in the US, catholics - non-catholics, foreigners - German citi
zen. The excellent agreement of phase diagrams and intermarriage data
encourages a calculation of the multicultural society by functions of
thermodynamics: Solubility corresponds to integration, miscibility gap
to segregation, free enthalpy to happiness and temperature to toleran
ce of a society. Only a high level of tolerance will integrate ghettos
and lead to a peaceful multicultural society.