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    The heat released or absorbed per unit mass by a system during a change of phase is called as:
    Question

    The heat released or absorbed per unit mass by a system during a change of phase is called as:

    A.

    Lapse rate

    B.

    Thermal conductivity

    C.

    Latent heat

    D.

    Langley

    Correct option is C

    The correct answer is: C) Latent heat
    Explanation:
    Latent heat is the amount of heat energy released or absorbed per unit mass of a substance during a change of phase (such as melting, freezing, vaporization, or condensation) without changing its temperature. This energy is used to alter the internal structure (like breaking or forming bonds) rather than changing the temperature of the material.
    Information Key Points:
    • Latent heat is involved in phase changes like melting (solid to liquid), boiling (liquid to gas), or condensation (gas to liquid).

    • During the phase change, temperature remains constant even though heat is absorbed or released.

    • Examples:

      • Latent heat of fusion (melting ice into water)

      • Latent heat of vaporization (boiling water into steam)

    Additional Information (Other Options):

    • Lapse rate: The lapse rate refers to the rate at which air temperature decreases with an increase in altitude.

    • Thermal conductivity: Thermal conductivity is a material’s ability to conduct heat.

    • Langley: A Langley is a unit of solar radiation, measuring the amount of heat received per unit area.

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