Difference Between Vaporisation and Evaporation: Meaning, Examples and Comparison Explained

Have you ever noticed that wet clothes dry naturally, while water in a kettle starts producing steam when heated? Although both processes involve the conversion of a liquid into vapour, they are not exactly the same. The two phenomena are known as evaporation and vaporisation.Many students often use these terms interchangeably, but understanding their differences is important in chemistry. 

The perfect guide covers the difference between vaporisation and evaporation in an explanation with examples and a detailed comparison.

Table of Contents 

• What is Vaporisation and Evaporation
• Difference Between Vaporisation and Evaporation

What is Vaporisation and Evaporation 

Vaporisation is the process in which a substance changes from the liquid state into the gaseous state. It is a type of phase transition and may occur through boiling or evaporation.

In simple words, vaporisation refers to the conversion of a liquid into vapour when sufficient energy is supplied to overcome the intermolecular forces between its molecules.

Characteristics of Vaporisation:

It converts liquid into gas, usually when heat energy is supplied it takes place throughout the liquid during boiling.Interestingly! Molecules from both the surface and interior can escape.The entire liquid can eventually be converted into vapour.

Some Common Examples of Vaporisation are:

• Water boils in a kettle.
• Steam generation in thermal power plants.
• Conversion of liquid nitrogen into gas.
• Formation of water vapour during cooking.

Evaporation is the slow conversion of a liquid into vapour from its surface at temperatures below its boiling point.

Lets Discuss its types.

Types of Vaporisation

1. Boiling

Boiling occurs when a liquid reaches its boiling point. At this temperature, bubbles are formed throughout the liquid and vaporisation takes place rapidly.

Example:
Water boiling at 100°C changes completely into steam.

2. Evaporation

Evaporation is a slower form of vaporisation that takes place only at the surface of a liquid.

Thus, evaporation is a type of vaporisation, but vaporisation is a broader term.

On the other hand,evaporation does not require the liquid to reach a specific temperature. Molecules having higher kinetic energy escape from the surface and enter the gaseous state.

Some Common Examples of Evaporation are:

• Drying clothes in sunlight. 
• Sweat evaporating from the skin.
• Perfume spreading into the air.
• Drying of wet roads after rain.
• Water stored in open containers gradually disappears.

Have you ever observed why evaporation causes cooling?

During evaporation, high-energy molecules escape from the liquid surface. As a result, the average kinetic energy of the remaining molecules decreases, causing a cooling effect.

Example:
Sweating helps regulate body temperature because the evaporation of sweat removes heat from the skin.

But what are the Characteristics of Evaporation?

It Occurs only at the surface of a liquid and takes place at all temperatures below the boiling point.It does not require continuous heating. It is a slow process and it causes cooling of the remaining liquid. 

Also Read: Condensation

Difference Between Vaporisation and Evaporation

Basis of Comparison	Vaporisation	Evaporation
Definition	Conversion of liquid into vapour by boiling or other processes	Slow conversion of liquid into vapour from the surface
Temperature	Usually occurs at the boiling point	Occurs below the boiling point
Heat Requirement	Generally requires heat	Can occur without external heating
Region of Occurrence	Throughout the liquid	Only at the surface
Speed of Process	Fast during boiling	Slow
Bubble Formation	Present during boiling	No bubble formation
Molecules Escaping	Surface and interior molecules	Only surface molecules
Amount of Liquid Converted	Entire liquid can change into vapour	Only surface molecules escape gradually
Cooling Effect	Not significant	Produces cooling
Example	Boiling water producing steam	Drying of clothes

Read More: Water Cycle 

We have learned that although the difference between vaporisation and evaporation both in chemistry involve the conversion of liquids into vapour, they are not identical processes. Vaporisation is a broader phenomenon that includes boiling and evaporation, whereas evaporation is a slow surface process occurring below the boiling point.