Mass is the measure of matter.Mass, a body of coherent matter, usually of indefinite shape and often of considerable size.
Density is how tightly packed some thing is.The state or quality of being dense; compactness closely set or crowded condition.
The state of a body perceived as having or generating a relatively high degree of warmth
The properties of attraction possessed by magnets; the molecular properties common to magnets.
A substance,body or device that readily conducts heat, electricity,sound,etc.