# Latent Heat of Fusion vs. Latent Heat of Solidification — What's the Difference?

By Tayyaba Rehman — Published on January 9, 2024

**Latent Heat of Fusion is the energy required for a substance to change from solid to liquid without temperature change, whereas Latent Heat of Solidification is the energy released when a liquid changes to a solid, also without temperature change.**

## Difference Between Latent Heat of Fusion and Latent Heat of Solidification

### Table of Contents

ADVERTISEMENT

## Key Differences

Phase Change Direction: The Latent Heat of Fusion refers to the process of a solid becoming a liquid. This occurs when a substance, like ice, absorbs heat and reaches its melting point. In contrast, the Latent Heat of Solidification is associated with a liquid turning into a solid. This happens when a substance like liquid water loses heat and solidifies or freezes.

Energy Absorption vs. Release: During the process of fusion, heat energy is absorbed by the substance to overcome the intermolecular forces that keep it solid. Conversely, during solidification, the substance releases energy as it transitions to a solid state, as the molecules come closer together and the intermolecular forces increase.

Temperature Stability: In both processes, the temperature of the substance remains constant during the phase change. The Latent Heat of Fusion keeps the temperature stable despite the absorption of heat, while in the Latent Heat of Solidification, the temperature remains stable even as heat is released.

Quantitative Aspect: The quantity of Latent Heat of Fusion is equal to the amount of Latent Heat of Solidification for a given substance. The amount of heat energy per unit mass required to melt a solid is equal to the energy released when the same amount of liquid solidifies.

Applications and Examples: The concept of Latent Heat of Fusion is critical in understanding processes like ice melting or metal smelting, while Latent Heat of Solidification is essential in processes like casting metals or making ice.

ADVERTISEMENT

## Comparison Chart

### Phase Change

Solid to liquid.

Liquid to solid.

### Energy Transfer

Heat energy absorbed.

Heat energy released.

### Temperature Change

No change in temperature.

No change in temperature.

### Quantitative Measure

Equal to heat of solidification for the same substance.

Equal to heat of fusion for the same substance.

### Applications

Melting ice, smelting metals.

Freezing water, metal casting.

## Compare with Definitions

#### Latent Heat of Fusion

Latent Heat of Fusion is key in processes where heat absorption is crucial for phase change.

In metalworking, the latent heat of fusion of metals determines the energy required for smelting.

#### Latent Heat of Solidification

It's the amount of heat per unit mass released when a liquid solidifies without temperature change.

The latent heat of solidification is an important factor in the design of freeze-casting processes.

#### Latent Heat of Fusion

Latent Heat of Fusion corresponds to the heat absorbed during melting.

Melting a block of ice requires absorbing a significant amount of latent heat of fusion.

#### Latent Heat of Solidification

Latent Heat of Solidification is crucial in processes where heat release is a part of phase change.

The metal casting industry relies on the latent heat of solidification to form solid metal parts.

#### Latent Heat of Fusion

It represents the thermal energy needed to overcome intermolecular forces in a solid.

The latent heat of fusion explains why ice maintains a constant temperature while melting.

#### Latent Heat of Solidification

Represents the thermal energy released due to increased intermolecular forces during solidification.

The latent heat of solidification is observed when lava turns into solid rock.

#### Latent Heat of Fusion

It's the amount of heat per unit mass to convert a solid to a liquid without temperature change.

Calculating the latent heat of fusion is essential in designing efficient refrigeration systems.

#### Latent Heat of Solidification

Latent Heat of Solidification corresponds to the heat given off during freezing.

In freezing water, the latent heat of solidification is released into the surroundings.

#### Latent Heat of Fusion

The energy required to change a solid into a liquid at constant temperature.

The latent heat of fusion of ice is critical in understanding the energy needed to melt it.

#### Latent Heat of Solidification

The energy released by a liquid as it becomes a solid at a constant temperature.

Water releases latent heat of solidification as it freezes into ice.

## Common Curiosities

#### Does the temperature change during solidification?

No, it stays constant while the liquid becomes solid.

#### Is the temperature stable during fusion?

Yes, it remains constant during the phase change.

#### What is Latent Heat of Fusion?

Energy absorbed for a solid to become liquid at constant temperature.

#### What does Latent Heat of Solidification mean?

Energy released when a liquid turns into a solid at constant temperature.

#### How is Latent Heat of Fusion measured?

As the amount of heat per unit mass required for melting.

#### What is the measurement for Latent Heat of Solidification?

The amount of heat per unit mass released during freezing.

#### Can Latent Heat of Solidification be positive?

No, it's typically a negative value indicating heat release.

#### How do these concepts apply in nature?

They are fundamental in natural processes like the melting of ice caps and freezing of water.

#### Can these latent heats be used for energy storage?

Yes, particularly in thermal energy storage systems.

#### Can Latent Heat of Fusion be negative?

No, it's always a positive value indicating heat absorption.

#### Are these concepts applicable to all substances?

Yes, all substances have characteristic latent heats for phase changes.

#### Do these concepts play a role in weather phenomena?

Absolutely, they're critical in understanding precipitation and frost formation.

#### Is the Latent Heat of Fusion the same for all solids?

No, it varies depending on the substance.

#### Are these latent heats important in industry?

Yes, especially in metallurgy, refrigeration, and climate modeling.

#### Does the Latent Heat of Solidification differ for different liquids?

Yes, it's specific to each substance.

## Share Your Discovery

Previous Comparison

True Solution vs. Colloidal SolutionNext Comparison

TV Series vs. Web Series## Author Spotlight

Written by

Tayyaba RehmanTayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.