Physical Properties of Materials:
Density - Defined as mass per unit volume. Usually denoted by r, it is expressed in units of kg/m3 or slug/in3.
Specific Weight - Defined as weight per unit volume. It can also be expressed as density multiplied by gravitational acceleration. Usually denoted by g, its units are N/m3 or lb/in3.
Specific Heat - Defined as the thermal energy adsorbing capability of a material per unit mass and per unit change in temperature. Usually denoted by C, it is expressed in units of J/kg°C or BTU/lb°F.
Coefficient of Thermal Conductivity - Defined as the capacity of a material to conduct thermal energy (heat) from higher temperature to lower temperature regions in it. Usually denoted by k, it is expressed in units of J/hr m °C or Btu/hr ft °F.
Coefficient of Thermal Expansion - Defined as a measure of material expansion (in terms of strain) per unit change in temperature. Usually denoted by a, it has units of 1/°F or 1/°C.