unmeltable

Unmeltable is an adjective used to describe a substance or material that cannot be melted. This property is typically associated with materials that exist in a solid state and do not undergo a phase transition to a liquid state when subjected to heat. The concept of unmeltable is often related to extremely high melting points, beyond the capabilities of common heating methods or temperatures encountered in everyday life.

In a scientific context, unmeltable materials may exhibit properties such as strong intermolecular forces or stable crystalline structures that require an immense amount of energy to overcome. For example, some refractory materials used in high-temperature applications, like certain ceramics or alloys, might be considered practically unmeltable under typical industrial conditions. The theoretical definition of unmeltable implies a substance whose melting point is at or above absolute zero, though in practical usage, it refers to materials that are exceedingly difficult to melt.

While the term can be applied literally, it can also be used metaphorically. In this sense, "unmeltable" might describe something unyielding, inflexible, or resistant to change, much like a substance that resists melting. This figurative usage emphasizes an inherent stability or resistance to external influences.