melting point
Definition
Noun: The specific temperature at which a solid substance changes state and becomes a liquid under standard atmospheric pressure. It is the point of equilibrium where the solid and liquid phases of a substance coexist.
Usage
The term "melting point" is used to describe a fundamental, measurable physical property of a pure crystalline substance. It is a constant under given pressure conditions. - It is commonly discussed in scientific contexts such as chemistry, physics, materials science, and engineering. - It is often used to identify a substance or assess its purity, as impurities typically lower and broaden the melting point range.
Examples
- The melting point of pure water is 0 degrees Celsius (32 degrees Fahrenheit).
- Different metals have different melting points; for example, the melting point of iron is much higher than that of lead.
- A sharp, precise melting point is an indicator of a pure compound.
Advanced Usage
- "To have a low/high melting point": Describes a substance's property relative to others.
- In figurative language, it can describe a point of dissolution or collapse under pressure, though this is an extended, non-scientific metaphor.
Variants and Related Words
- Freezing point: The temperature at which a liquid turns into a solid. For a given substance, the melting point and freezing point are theoretically the same temperature.
- Phase transition: The more general term for a change from one state of matter (solid, liquid, gas) to another.
- Fusion (in physics/chemistry): The process of melting.
Synonyms
- Liquefaction temperature (more technical).
- Fusion point (scientific synonym).
Antonyms
- Freezing point (specifically for the reverse process).
- Solidification point.
Related Phrases/Idioms
- "To reach its melting point": Used literally for materials or figuratively for situations or emotions.
Noun
-
the temperature below which a liquid turns into a solid
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
