Difference Wiki

Boiling Point vs. Melting Point: What's the Difference?

Edited by Huma Saeed || By Sumera Saeed || Updated on October 7, 2023
Boiling point is the temperature at which a liquid turns into a gas, while the melting point is the temperature at which a solid becomes a liquid.

Key Differences

In the context of physical chemistry and thermodynamics, the boiling point is an intrinsic property related to the transition of liquid to gas. Every substance has a specific boiling point under a defined atmospheric pressure, typically measured under standard atmospheric pressure. The boiling point can be influenced by atmospheric pressure, where higher elevations with lower pressure have lower boiling points. On the other hand, the melting point denotes the precise temperature at which a solid turns into a liquid.
Sumera Saeed
Oct 07, 2023
Melting point is crucial in understanding the solid phase of matter. Substances become less ordered as they absorb heat and the molecular motion increases, prompting the transition from solid to liquid. The melting point is specifically the temperature at which this phase transition occurs under standard pressure. The melting point, unlike the boiling point, is not greatly affected by atmospheric pressure since the volume change during melting is relatively small.
Sumera Saeed
Oct 07, 2023
The boiling point is inherently associated with the vaporization process, which is endothermic, meaning it absorbs heat. At the boiling point, the vapor pressure of a liquid equals the external pressure, and bubbles of vapor form within the liquid. A unique characteristic of boiling point is that the temperature remains constant during the entire boiling process despite the continuous input of heat.
Sumera Saeed
Oct 07, 2023
In contrast, the melting point is linked to the heat of fusion, and similarly to boiling, temperature remains stable during the whole melting process. However, there are substances, such as amorphous solids and glasses, that do not have a precise melting point. For these materials, a range of temperatures, known as the melting point range, is provided to represent the transition from a rigid to a viscous or liquid state.
Aimie Carlson
Oct 07, 2023
Both boiling point and melting point serve as critical reference points for phase transitions in various scientific and industrial applications. The boiling point is vital for distillation processes and the liquefaction of gases, while the melting point is crucial in metallurgy, material science, and manufacturing to ensure materials transition to a liquid phase in a controlled manner.
Harlon Moss
Oct 07, 2023
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Comparison Chart

Phase Transition

Liquid to Gas
Solid to Liquid
Sumera Saeed
Oct 07, 2023

Temperature Stability

Remains constant while boiling
Remains constant while melting
Sumera Saeed
Oct 07, 2023

Affected by Pressure

Yes, decreases with reduced pressure
No, negligibly affected by pressure
Sumera Saeed
Oct 07, 2023

Example Substance

Water (100°C at 1atm)
Ice (0°C at 1atm)
Janet White
Oct 07, 2023

Application

Distillation processes in chemistry
Metallurgy and material manufacturing
Janet White
Oct 07, 2023
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Boiling Point and Melting Point Definitions

Boiling Point

Boiling point is subject to change under different atmospheric pressures.
The boiling point of water decreases as we ascend in altitude.
Sumera Saeed
Oct 07, 2023

Melting Point

Melting points are crucial for determining the purity of a substance in chemistry.
A pure substance has a distinct and sharp melting point, utilized for identification in labs.
Harlon Moss
Oct 07, 2023

Boiling Point

The boiling point involves an endothermic process where heat is absorbed without changing temperature.
The boiling point remains consistent even as a liquid turns to vapor.
Harlon Moss
Oct 07, 2023

Melting Point

Amorphous solids and glasses may not have a sharp melting point but rather a range.
Glass transitions over a range of temperatures instead of having a fixed melting point.
Sara Rehman
Oct 07, 2023

Boiling Point

The boiling point is the temperature at which a substance transitions from a liquid to a gas.
Water has a boiling point of 100 degrees Celsius under normal atmospheric pressure.
Huma Saeed
Oct 07, 2023

Melting Point

The melting point signifies the temperature where a solid transforms into a liquid.
Ice has a melting point of 0 degrees Celsius.
Sumera Saeed
Oct 07, 2023

Boiling Point

It's a specific thermal milestone where vapor pressure equals atmospheric pressure.
The boiling point is crucial in culinary processes like cooking pasta.
Sumera Saeed
Oct 07, 2023

Melting Point

Melting point is usually less impacted by pressure changes than the boiling point.
The melting point of chocolate is crucial to confectionery manufacturing.
Huma Saeed
Oct 07, 2023

Boiling Point

It is an identifiable and repeatable point on a heating curve for pure substances.
The boiling point of ethanol is lower than that of water, causing it to evaporate sooner in a mixture.
Aimie Carlson
Oct 07, 2023

Melting Point

The temperature remains stable during the melting process at the melting point.
The melting point of a substance is unchanged even when more heat is applied.
Sumera Saeed
Oct 07, 2023

FAQs

Can the boiling point be altered?

Yes, altering the pressure conditions changes the boiling point of a substance.
Sumera Saeed
Oct 07, 2023

Is melting point affected by pressure changes?

Melting point is generally not significantly influenced by pressure changes.
Sumera Saeed
Oct 07, 2023

What is the boiling point?

The boiling point is the temperature at which a liquid becomes a gas.
Sumera Saeed
Oct 07, 2023

What happens to molecular movement at the melting point?

At the melting point, molecules gain enough energy to break free from their rigid structure.
Sara Rehman
Oct 07, 2023

What is a notable difference between boiling and melting points?

The boiling point pertains to the transition from liquid to gas, while the melting point pertains to solid to liquid.
Sara Rehman
Oct 07, 2023

How does altitude affect boiling point?

Higher altitudes have lower atmospheric pressure, thus lowering the boiling point of substances.
Sumera Saeed
Oct 07, 2023

What is the significance of the melting point in manufacturing?

The melting point is crucial to manipulate materials correctly in manufacturing processes.
Aimie Carlson
Oct 07, 2023

How does impurity affect the boiling point?

Impurities typically elevate the boiling point of a substance.
Aimie Carlson
Oct 07, 2023

How is the melting point defined?

The melting point is the temperature at which a solid transitions into a liquid.
Huma Saeed
Oct 07, 2023

Why does boiling occur?

Boiling occurs when the vapor pressure of a liquid equals the external pressure.
Sumera Saeed
Oct 07, 2023

Can the boiling point be used to identify substances?

Yes, the boiling point is a characteristic property and can be used for identification.
Sara Rehman
Oct 07, 2023

Is melting point applicable to all solids?

Most solids have a melting point, but amorphous solids transition over a range of temperatures.
Harlon Moss
Oct 07, 2023

Are boiling and evaporating the same?

No, boiling occurs at a specific temperature, while evaporation can happen at any temperature.
Janet White
Oct 07, 2023

What is a common use of melting points?

In laboratories, melting points are used to help determine a substance’s purity.
Sumera Saeed
Oct 07, 2023

Can substances bypass the melting point and sublimate?

Yes, some substances, like dry ice, sublimate, going directly from solid to gas.
Sara Rehman
Oct 07, 2023

Do impurities impact the melting point?

Yes, impurities usually lower and broaden the melting point range of a substance.
Harlon Moss
Oct 07, 2023

What is the melting point of ice?

Ice melts at 0 degrees Celsius under standard atmospheric pressure.
Sumera Saeed
Oct 07, 2023

Why does temperature remain constant at the boiling point?

The added heat energy goes into breaking intermolecular forces, not increasing temperature.
Harlon Moss
Oct 07, 2023

What happens to water at its boiling point of 100°C?

At 100°C, water undergoes a phase transition from liquid to gas.
Janet White
Oct 07, 2023

How is melting point measured?

Melting point is measured using instruments like melting point apparatus in a laboratory.
Janet White
Oct 07, 2023
About Author
Written by
Sumera Saeed
Sumera is an experienced content writer and editor with a niche in comparative analysis. At Diffeence Wiki, she crafts clear and unbiased comparisons to guide readers in making informed decisions. With a dedication to thorough research and quality, Sumera's work stands out in the digital realm. Off the clock, she enjoys reading and exploring diverse cultures.
Edited by
Huma Saeed
Huma is a renowned researcher acclaimed for her innovative work in Difference Wiki. Her dedication has led to key breakthroughs, establishing her prominence in academia. Her contributions continually inspire and guide her field.

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