The physical properties of a substance are those characteristics that can be measured without changing the composition of the substance. These properties can be further subdivided into intensive and extensive properties. An intensive property does not depend on the amount of substance under consideration. An extensive property do depend on the amount of substance present. A typical set of intensive physical properties that can be used to identify the various forms of carbon are as follows:    Density Specific Heat Elasticity  Malleability  Ductibility  Tensile Strength    Color Thermal Conductivity Hardness Electrical Conductivity Melting & Boiling Point Magnetic Susceptibility