What is Physical Chemistry? Chemistry works with an enormous number of substance ......;it is an extensive science .Physics on the other hand works with rather few substance......;it is an intensive science.Physical chemistry is the child of these two sciences:it has inherited the extensive character from chemical.Upon this depends its all-embracing feature, with has attested so great admiration.Physical chemistry may be regarded as an excellent school of exact reasoning for all students of natural science. Arrhenius S AWhat is Physical Chemistry? Chemistry Chemistry works with an enormous number of substance ……;it is an extensive science .Physics Physics on the other hand works with rather few substance ……; it is an intensive science. Physical chemistry Physical chemistry is the child of these two sciences; it has inherited the extensive character from chemical. Upon this depends its all – embracing feature, with has attested so great admiration .Physical chemistry may be regarded as an excellent school of exact reasoning for all students of natural science. Arrhenius S A