We often hear since childhood that a block of ice melts to give chilled water; we also talk about the water turning to steam, which is used for rotating turbines and generating electricity.
However, we come across the phenomenon when we study science. This article discusses the latent heat of fusion formula.
So, latent heat of fusion is the amount of inner or latent heat a solid gains (melting) to transform into a liquid state or the liquid state to gaseous (boiling).
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Latent Heat of Fusion Meaning
Latent heat means the energy required to change an object’s state. Fusion means combination. Overall, latent heat of fusion means the added energy or heat because of which an object changes to another state.
Here, it is about the transformation of solid to liquid, which is melting and liquid to a gaseous state, which is called the boiling process.
Heat and Temperature
Under the chapter on Thermodynamics, we represent a parameter heat by an English block letter ‘Q’. We often jumble the word ‘heat’ with ‘temperature’; however, these two terms have huge differences.
Heat is the effect of an object generating vibrations in particles inside the object. We also consider heat as the rise in entropy of particles or the kinetic energy of these under the effect of rising temperatures.
Temperature is something that can be both high and low, while heat is always rising.
Now, when the heat is latent, for example, you have an inner heat and when you sleep, your body reaches the Gibbs’ free energy state because that time your body loses heat and its temperature falls.
Latent Heat of Fusion Formula
So, the formula of latent heat of fusion is given by:
△Q = mL, which is the required equation for the latent heat of fusion
△Q = change in heat energy in Joules
m = mass in Kg
L = Specific latent heat of fusion
So, do you know what the specific latent heat of fusion is?
Specific Latent Heat of Fusion
We define the specific latent heat as the energy required to transform or change the state of 1 kg of substance.
However, the specific latent heat of fusion is the energy needed to melt a kilogram of substance.
There is another term called the specific latent heat of vaporization. We define the specific latent heat of vaporization as the energy required to boil or evaporate a kilogram of substance.
However, the formula for Specific Latent Heat of Fusion is
Specific Latent Heat of Fusion Formula
The formula of specific latent heat of fusion is given by:
Q = mL, which is the required specific latent heat of fusion equation.
Specific Latent Heat of Fusion Equation
We define the specific latent heat of fusion equation in the following manner:
If ‘m’ kg of solid substance changes to liquid state at a constant temperature, which is its melting point, the heat absorbed by the substance or the latent heat of fusion formula is given by:
Q = m L
L = specific latent heat of fusion of substance that is measured in Joule per kilogram or J/kg.
A matter transforms from one state to another because of a hidden heat, which is latent. If energy is added to rise by 1 kg, it is the specific latent heat of fusion. Both are measured in J/kg.