1) Chemical property 
Fusibility is the ease with which a material will melt. Materials such as solder require a low melting point so that when heat is applied to a joint, the solder will melt before the materials being soldered melt, i.e. high fusibility. On the other hand, firebricks used for furnace linings only melt at very high temperatures and so have low fusibil...
• (n.) The quality of being fusible.
Fu'si·bil'i·ty noun [ Confer French fusibilité .] The quality of being fusible. 
The ability of a material to fuse or melt.
the quality of being fusible or convertible from a solid to a liquid state by heat. · the degree to which a substance is fusible.