Density is both a(n) property and a(n) property of matter.

Density is both a scalar and extrinsic property of matter. It can be determined by the mass of an object and how much it takes up space (volume).  Or density is equal to mass over volume. It is represented by the formula D = M/V where D is the density in kg/m^3 or lb/ft^3, M is the mass in kg or lb and V is the volume in m^3 or ft^3. 

For example, you are given the mass of an object of 40.5kg and a volume of 15m^3. Find its density.   

D = M/V 
D = (40.5 kg) / (15 m^3) 
D = 27/10 or 2.7 kg/m^3 

electrical to thermal

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.