Melting is when solids are heated above their melting point, and colloidal systems are suspensions of solid matter in liquids. Given these facts, melting is when something that is part of what is heated above its melting point among the following options:
- organic molecules
 - gas
 - measuring system
 - Water expanding
 - colloidal system
 - objects that have mass
 - pot
 - an object


 

     colloidal system    