Chemistry

Difference Between Evaporation and Boiling

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Main Difference

The main difference between Evaporation and Boiling is that Evaporation considers as the vaporization of liquid at room temperature, whereas Boiling is the vaporization of liquid when heated at its maximum boiling pint.

Evaporation vs. Boiling

The vaporization of liquid takes place at room temperature in the process of evaporation, while the vaporization of liquid takes place at the boiling point of the liquid in the process of boiling. Evaporation could occur at any given temperature, whereas boiling occurs only at the given boiling point of the liquid, and the required temperature for boiling the liquid remains constant throughout the boiling process. The surface molecules mostly contribute to the whole process of evaporation, so evaporation occurs primarily at the surface of liquids; on the other hand, boiling occurs during the whole boiling of liquid.

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When evaporation occurs on the bulk liquid body, the temperature of the liquid body tends to decrease; on the contrary, when boiling takes place on a bulk liquid body, the temperature tends to remain constant in the whole process of boiling. When the quality of the air present above the liquid remains unsaturated, the process of evaporation continues to take place; on the flip side, when the liquid pressure present inside the boiling process remains equal to the external pressure of the boiling then process of boiling continue to take place. In evaporation, bubbles are not formed; on the other hand, bubbles are formed in boiling.

In evaporation, energy is supplied to the reaction by the surrounding; on the contrary, a main source of energy is required to carry out the boiling process. Evaporation is considered the slow process; on the flip side, boiling is generally the fast process. During evaporation, the temperature of the liquid reduces, while the temperature of the boiling remains constant throughout the process.

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In results, the evaporation causes the cooling of the liquid, whereas heat forms in the result of boiling and does not cause cooling of the liquid. As the rate of evaporation directly depends on the surface area temperature, so it means large surface area provides fast evaporation of the liquid; on the other hand, in boiling, the temperature does not increase further from the boiling point of water, i.e., 100 degrees’ centigrade even although there is given the continuous supply of heat.

Comparison Chart

EvaporationBoiling
The procedure of change of a liquid into vapor form at a temperature below the boiling point of a liquid is known as evaporation.The procedure from which a liquid usually changes in a vapor form when it is being heated at liquids boiling point is known as boiling.
Temperature Contribution
Could occur at any given temperatureOccurs only at the given boiling point of the liquid
The Behavior of Liquid Molecules
Surface molecules mostly contribute to the whole process.It occurs during the whole boiling of liquid.
Effect on Bulk Liquid Body
When it occurs on the bulk liquid body, the temperature of the liquid body tends to decrease.When it takes place on a bulk liquid body, the temperature tends to remain constant in the whole process.
The Superiority of the Air Above the Liquid Phase
When the quality of the air present above the liquid remains unsaturated, the process continues to take place.When the liquid pressure present inside remains equal to the external pressure, then the process continues to take place.
Bubbles
Bubbles are not formed.Bubbles are formed.
Energy
Energy is supplied to the reaction by the surrounding.A main source of energy is required to carry out the process.
Speed
It considered a slow process.It generally the fast process.
Temperature
The temperature of the liquid reducesThe temperature of the boiling remains constant
In Results
Cause cooling of the liquidHeat forms in the result and does not cause cooling of the liquid
Boiling and Rate
The rate of evaporation directly depends on the surface area temperature, so it means a large surface area provides fast evaporation of the liquid.The temperature does not increase further from the boiling point of water, i.e., 100 degrees centigrade even although there is given a continuous supply of heat.
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What is Evaporation?

The term evaporation is defined as the method of escaping liquid molecules from the exterior of a liquid at any given temperature is called evaporation. The degree of liquid evaporation directly depends on its temperature, surface area, and amount of water vapor that are existing in the surrounding air.

Evaporation is a spontaneous procedure that usually happens at room temperature because of liquid molecules having high energy are escaping into the air of surrounding. The molecules which are present in a liquid have a fixed amount of liberty of movement, and they have different quantities of kinetic energies. Hence, molecules having a greater amount of kinetic energy will have more affinity of evading into a gaseous state by overpowering the pressures and stresses that might hold the molecule back.

Usually, the molecules which are present on the surface of the liquid are normally the ones that get evaporated, and they usually need only a little amount of energy to escape out from the liquid. Though some molecules with a less percentage of a number are present deeper in the liquid, usually get evaporated and cross the surface of the liquid dodging crashes present in the liquid, showing that they possess a sufficient amount of kinetic energy.

When the quality of the air present above the liquid remains unsaturated, the process of evaporation continues to take place, which means that the air present above the liquid should be able to provide accommodations to the incoming molecules of the liquid. These accommodating molecules absorb heat energy and then converts into their kinetic energy.

What is Boiling?

The term boiling considers as the method in which the liquid stage alters into the gaseous phase at a given constant temperature. The limit where the liquid converts into the gaseous phase at a given temperature and pressure are generally known as a ‘boiling point.’ 100°c is the normal atmospheric pressure of the boiling point of the water.

When the liquid is heated, the molecules present within the liquid started to absorb the provided heat energy and increase their kinetic energy, which increases evaporation, that occurs as long as the air rests unsaturated. Though, when the liquid pressure present inside the boiling process remains equal to the external pressure of the boiling, then the process of boiling continues to take place.

The process of boiling occurs only at the given boiling point of the liquid, and the required temperature for boiling the liquid remains constant throughout the boiling process. Boiling depends on the pressure which is applied to the liquid, i.e., the higher the pressure, the greater will be the boiling point and vice versa. In the process of boiling, when the molecules of the liquid are more extent that they can change its form, then the bubbles are produced, and the process of boiling starts.

Key Differences

  1. In evaporation, the liquid’s vaporization occurs at room temperature, while in boiling, the liquid’s vaporization occurs at the boiling point of the liquid.
  2. Any given temperature is enough to start the evaporation process, whereas the boiling of the liquid only occurs at the given boiling point of the liquid.
  3. Evaporation occurs primarily at the surface of liquids; on the other hand, boiling occurs during the whole boiling of liquid.
  4. The temperature of the liquid body in evaporation inclines to decrease when evaporation occurs on the main part of the liquid body; on the contrary, the temperature inclines to remain constant in the whole process of boiling when boiling occurs on a main part of the liquid body.
  5. The process of the evaporation continues to take place when the quality of the air remains unsaturated which is present above the liquid; on the flip side, the process of boiling continues to take place when the liquid pressure remains equal to the external pressure of the boiling which is present inside the boiling process.
  6. Bubbles are not produced in evaporation; on the other hand, bubbles are produced in boiling.
  7. In evaporation, the energy is provided to the reaction by the surrounding; on the contrary, to carry out the boiling process, a main source of energy is required.
  8. Evaporation is usually considered a gradual process; on the flip side, boiling is generally considered as the fast process.
  9. The temperature of the liquid decreases during evaporation, while to continue the boiling process, the temperature of the boiling remains constant throughout the process.
  10. The cooling of the liquid is caused by the evaporation, whereas boiling does not cause the cooling of the liquid and forms heat as a result.
  11. The fast evaporation of the liquid is caused by the large surface area; on the other hand, the temperature does not increase further in boiling from the boiling point of water.

Conclusion

Above discussion concludes that the evaporation considers as the vaporization of liquid at room temperature and the large surface area provides fast evaporation of the liquid, whereas boiling is the vaporization of liquid when heated at its maximum boiling pint and the temperature of the boiling remains constant throughout the process to continue the boiling process.

Harlon Moss

Harlon currently works as a quality moderator and content writer for Difference Wiki. He graduated from the University of California in 2010 with a degree in Computer Science. Follow him on Twitter @HarlonMoss

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