Latent Heat of Fusion Formula
We can calculate the Latent Heat of Fusion using the following formula:
Q = mL + mcΔT
Where,
- Q is the latent heat of fusion,
- m is the mass of body,
- L is the specific latent heat of fusion,
- c is the specific heat of body,
- ΔT is the temperature change during heat absorption.
If there is no change in temperature(ΔT = 0) and energy provided to the matter is only used for the transition of phase, then
Q = mL
Where,
- Q is the latent heat of fusion,
- m is the mass of body,
- L is the specific latent heat of fusion,
Specific Heat of Fusion
The specific heat of fusion is the amount of energy required to change the phase of a unit mass of a substance from solid to liquid, without changing its temperature. As there is phase change happening in this transfer of energy the substance should be at the melting point in temperature already. As specific heat of fusion varies for different substances. Some commonly known values are:
- Specific Heat of Fusion of Water: 334 J/g or 79.7 cal/g
- Specific Heat of Fusion of Lead: 24.5 J/g or 5.85 cal/g
- Specific Heat of Fusion of Iron: 272 J/g or 65 cal/g
- Specific Heat of Fusion of Copper: 205 J/g or 49 cal/g
- Specific Heat of Fusion of Gold: 63 J/g or 15 cal/g
These values represent the amount of heat energy required to change 1 gram of the substance from solid to liquid at its melting point.
Molar Heat of Fusion
Similar to specific heat of fusion, molar heat of fusion is defined as the amount of energy required to change the phase of a unit mass of a substance from solid to liquid, without changing its temperature. As phase change only happens when a substance is heated to the melting point, thus the substance under consideration for molar heat of fusion is already at the melting point.
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Latent Heat of Fusion
Latent Heat of Fusion is one of the latent heats in chemistry like the latent heat of vaporization and latent heat of sublimation. When a substance is changing its phase from liquid to solid or solid to the gas of gas to a liquid, this latent heat comes in handy to find the energy of the reaction. Latent Heat of Fusion is related to the solid-to-liquid phase change. In this article, we will explore all the topics related to the latent heat of fusion and its formula. We’ll also learn about the latent heat of fusion for various different elements as well as compounds.
Let’s start our learning about the concept with the name “Latent Heat of Fusion”.