heat of fusion

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heat of fusion

The ice cube absorbs heat of fusion as it melts into a puddle of water.

Definition
  1. Noun:
    • The amount of heat energy required to change a unit mass of a substance from a solid to a liquid at its melting point, without changing its temperature. This is a specific physical property of a substance. The same amount of energy is released when the liquid solidifies (heat of solidification).
Usage
  • Heat of fusion is a scientific term used primarily in physics and chemistry.
  • It is used when discussing phase changes, thermal energy calculations, and material properties.
  • It is often represented by the symbol ΔH_f.
Examples
  • The heat of fusion of ice is 334 joules per gram. This means 334 J are needed to melt 1 gram of ice at 0°C into water at 0°C.
  • To design the cooling system, engineers must consider the heat of fusion of the material used for thermal storage.
  • A high heat of fusion explains why melting a large amount of metal requires a significant input of energy from the furnace.
Advanced Usage
  • "Latent heat of fusion": This is a more precise synonym, emphasizing that the heat energy is "hidden" as it changes the substance's state without changing its temperature.
    • The latent heat of fusion for water is a key factor in regulating Earth's climate.
  • The concept is crucial in calorimetry equations: Q = m * ΔHf, where Q is heat, m is mass, and ΔHf is the heat of fusion.
Variants and Related Words
  • Heat of solidification (n): The heat released when a unit mass of a liquid solidifies at its freezing point. It is numerically equal to the heat of fusion.
  • Heat of vaporization (n): The amount of heat required to change a unit mass of a liquid into a gas at its boiling point.
  • Latent heat (n): The general term for heat absorbed or released during a phase change at constant temperature (includes fusion and vaporization).
  • Enthalpy of fusion (n): A thermodynamic term essentially synonymous with heat of fusion, often used in more formal chemical contexts.
Synonyms
  • Latent heat of fusion
  • Enthalpy of fusion (in thermodynamics)
Related Scientific Concepts
  • Phase change: The physical process (melting, freezing, vaporization, condensation) during which heat of fusion or vaporization is involved.
  • Specific heat capacity: The heat required to raise the temperature of a unit mass by one degree, distinct from the heat required for a phase change.
  • Thermodynamics: The branch of physics that deals with heat, work, and energy, where the concept of heat of fusion is formally defined.
heat of fusion

The ice cube absorbs heat of fusion as it melts into a puddle of water.

Noun
  1. heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature
    • the heat of fusion is equal to the heat of solidification